diff --git a/frontend/lib/registry/components/split-panel-layout/SplitPanelLayoutComponent.tsx b/frontend/lib/registry/components/split-panel-layout/SplitPanelLayoutComponent.tsx
index 50f7c41b..869d2c3c 100644
--- a/frontend/lib/registry/components/split-panel-layout/SplitPanelLayoutComponent.tsx
+++ b/frontend/lib/registry/components/split-panel-layout/SplitPanelLayoutComponent.tsx
@@ -33,6 +33,7 @@ import {
   DialogDescription,
 } from "@/components/ui/dialog";
 import { Label } from "@/components/ui/label";
+import { Tabs, TabsList, TabsTrigger } from "@/components/ui/tabs";
 import { useTableOptions } from "@/contexts/TableOptionsContext";
 import { TableFilter, ColumnVisibility, GroupSumConfig } from "@/types/table-options";
 import { useAuth } from "@/hooks/useAuth";
@@ -171,6 +172,12 @@ export const SplitPanelLayoutComponent: React.FC<SplitPanelLayoutComponentProps>
   const [rightSearchQuery, setRightSearchQuery] = useState("");
   const [isLoadingLeft, setIsLoadingLeft] = useState(false);
   const [isLoadingRight, setIsLoadingRight] = useState(false);
+
+  // 🆕 추가 탭 관련 상태
+  const [activeTabIndex, setActiveTabIndex] = useState(0); // 0 = 기본 탭 (우측 패널), 1+ = 추가 탭
+  const [tabsData, setTabsData] = useState<Record<number, any[]>>({}); // 탭별 데이터 캐시
+  const [tabsLoading, setTabsLoading] = useState<Record<number, boolean>>({}); // 탭별 로딩 상태
+
   const [rightTableColumns, setRightTableColumns] = useState<any[]>([]); // 우측 테이블 컬럼 정보
   const [expandedItems, setExpandedItems] = useState<Set<any>>(new Set()); // 펼쳐진 항목들
   const [leftColumnLabels, setLeftColumnLabels] = useState<Record<string, string>>({}); // 좌측 컬럼 라벨
@@ -1001,12 +1008,137 @@ export const SplitPanelLayoutComponent: React.FC<SplitPanelLayoutComponentProps>
     ],
   );
 
+  // 🆕 추가 탭 데이터 로딩 함수
+  const loadTabData = useCallback(
+    async (tabIndex: number, leftItem: any) => {
+      const tabConfig = componentConfig.rightPanel?.additionalTabs?.[tabIndex - 1];
+      if (!tabConfig || !leftItem || isDesignMode) return;
+
+      const tabTableName = tabConfig.tableName;
+      if (!tabTableName) return;
+
+      setTabsLoading((prev) => ({ ...prev, [tabIndex]: true }));
+      try {
+        // 조인 키 확인
+        const keys = tabConfig.relation?.keys;
+        const leftColumn = tabConfig.relation?.leftColumn || keys?.[0]?.leftColumn;
+        const rightColumn = tabConfig.relation?.foreignKey || keys?.[0]?.rightColumn;
+
+        let resultData: any[] = [];
+
+        if (leftColumn && rightColumn) {
+          // 조인 조건이 있는 경우
+          const { entityJoinApi } = await import("@/lib/api/entityJoin");
+          const searchConditions: Record<string, any> = {};
+
+          if (keys && keys.length > 0) {
+            // 복합키
+            keys.forEach((key) => {
+              if (key.leftColumn && key.rightColumn && leftItem[key.leftColumn] !== undefined) {
+                searchConditions[key.rightColumn] = leftItem[key.leftColumn];
+              }
+            });
+          } else {
+            // 단일키
+            const leftValue = leftItem[leftColumn];
+            if (leftValue !== undefined) {
+              searchConditions[rightColumn] = leftValue;
+            }
+          }
+
+          console.log(`🔗 [추가탭 ${tabIndex}] 조회 조건:`, searchConditions);
+
+          const result = await entityJoinApi.getTableDataWithJoins(tabTableName, {
+            search: searchConditions,
+            enableEntityJoin: true,
+            size: 1000,
+          });
+
+          resultData = result.data || [];
+        } else {
+          // 조인 조건이 없는 경우: 전체 데이터 조회 (독립 탭)
+          const { entityJoinApi } = await import("@/lib/api/entityJoin");
+          const result = await entityJoinApi.getTableDataWithJoins(tabTableName, {
+            enableEntityJoin: true,
+            size: 1000,
+          });
+          resultData = result.data || [];
+        }
+
+        // 데이터 필터 적용
+        const dataFilter = tabConfig.dataFilter;
+        if (dataFilter?.enabled && dataFilter.conditions?.length > 0) {
+          resultData = resultData.filter((item: any) => {
+            return dataFilter.conditions.every((cond: any) => {
+              const value = item[cond.column];
+              const condValue = cond.value;
+              switch (cond.operator) {
+                case "equals":
+                  return value === condValue;
+                case "notEquals":
+                  return value !== condValue;
+                case "contains":
+                  return String(value).includes(String(condValue));
+                default:
+                  return true;
+              }
+            });
+          });
+        }
+
+        // 중복 제거 적용
+        const deduplication = tabConfig.deduplication;
+        if (deduplication?.enabled && deduplication.groupByColumn) {
+          const groupedMap = new Map<string, any>();
+          resultData.forEach((item) => {
+            const key = String(item[deduplication.groupByColumn] || "");
+            const existing = groupedMap.get(key);
+            if (!existing) {
+              groupedMap.set(key, item);
+            } else {
+              // keepStrategy에 따라 유지할 항목 결정
+              const sortCol = deduplication.sortColumn || "start_date";
+              const existingVal = existing[sortCol];
+              const newVal = item[sortCol];
+              if (deduplication.keepStrategy === "latest" && newVal > existingVal) {
+                groupedMap.set(key, item);
+              } else if (deduplication.keepStrategy === "earliest" && newVal < existingVal) {
+                groupedMap.set(key, item);
+              }
+            }
+          });
+          resultData = Array.from(groupedMap.values());
+        }
+
+        console.log(`🔗 [추가탭 ${tabIndex}] 결과 데이터:`, resultData.length);
+        setTabsData((prev) => ({ ...prev, [tabIndex]: resultData }));
+      } catch (error) {
+        console.error(`추가탭 ${tabIndex} 데이터 로드 실패:`, error);
+        toast({
+          title: "데이터 로드 실패",
+          description: `탭 데이터를 불러올 수 없습니다.`,
+          variant: "destructive",
+        });
+      } finally {
+        setTabsLoading((prev) => ({ ...prev, [tabIndex]: false }));
+      }
+    },
+    [componentConfig.rightPanel?.additionalTabs, isDesignMode, toast],
+  );
+
   // 좌측 항목 선택 핸들러
   const handleLeftItemSelect = useCallback(
     (item: any) => {
       setSelectedLeftItem(item);
       setExpandedRightItems(new Set()); // 좌측 항목 변경 시 우측 확장 초기화
-      loadRightData(item);
+      setTabsData({}); // 🆕 모든 탭 데이터 초기화
+
+      // 🆕 현재 활성 탭에 따라 데이터 로드
+      if (activeTabIndex === 0) {
+        loadRightData(item);
+      } else {
+        loadTabData(activeTabIndex, item);
+      }
 
       // 🆕 modalDataStore에 선택된 좌측 항목 저장 (단일 선택)
       const leftTableName = componentConfig.leftPanel?.tableName;
@@ -1017,7 +1149,30 @@ export const SplitPanelLayoutComponent: React.FC<SplitPanelLayoutComponentProps>
         });
       }
     },
-    [loadRightData, componentConfig.leftPanel?.tableName, isDesignMode],
+    [loadRightData, loadTabData, activeTabIndex, componentConfig.leftPanel?.tableName, isDesignMode],
+  );
+
+  // 🆕 탭 변경 핸들러
+  const handleTabChange = useCallback(
+    (newTabIndex: number) => {
+      setActiveTabIndex(newTabIndex);
+
+      // 선택된 좌측 항목이 있으면 해당 탭의 데이터 로드
+      if (selectedLeftItem) {
+        if (newTabIndex === 0) {
+          // 기본 탭: 우측 패널 데이터가 없으면 로드
+          if (!rightData || (Array.isArray(rightData) && rightData.length === 0)) {
+            loadRightData(selectedLeftItem);
+          }
+        } else {
+          // 추가 탭: 해당 탭 데이터가 없으면 로드
+          if (!tabsData[newTabIndex]) {
+            loadTabData(newTabIndex, selectedLeftItem);
+          }
+        }
+      }
+    },
+    [selectedLeftItem, rightData, tabsData, loadRightData, loadTabData],
   );
 
   // 우측 항목 확장/축소 토글
@@ -2534,6 +2689,34 @@ export const SplitPanelLayoutComponent: React.FC<SplitPanelLayoutComponentProps>
         className="flex flex-shrink-0 flex-col"
       >
         <Card className="flex flex-col border-0 shadow-none" style={{ height: "100%" }}>
+          {/* 🆕 탭 바 (추가 탭이 있을 때만 표시) */}
+          {(componentConfig.rightPanel?.additionalTabs?.length || 0) > 0 && (
+            <div className="flex-shrink-0 border-b">
+              <Tabs
+                value={String(activeTabIndex)}
+                onValueChange={(value) => handleTabChange(Number(value))}
+                className="w-full"
+              >
+                <TabsList className="h-9 w-full justify-start rounded-none border-b-0 bg-transparent p-0 px-2">
+                  <TabsTrigger
+                    value="0"
+                    className="h-8 rounded-none border-b-2 border-transparent px-4 data-[state=active]:border-primary data-[state=active]:bg-transparent data-[state=active]:shadow-none"
+                  >
+                    {componentConfig.rightPanel?.title || "기본"}
+                  </TabsTrigger>
+                  {componentConfig.rightPanel?.additionalTabs?.map((tab, index) => (
+                    <TabsTrigger
+                      key={tab.tabId}
+                      value={String(index + 1)}
+                      className="h-8 rounded-none border-b-2 border-transparent px-4 data-[state=active]:border-primary data-[state=active]:bg-transparent data-[state=active]:shadow-none"
+                    >
+                      {tab.label || `탭 ${index + 1}`}
+                    </TabsTrigger>
+                  ))}
+                </TabsList>
+              </Tabs>
+            </div>
+          )}
           <CardHeader
             className="flex-shrink-0 border-b"
             style={{
@@ -2546,16 +2729,28 @@ export const SplitPanelLayoutComponent: React.FC<SplitPanelLayoutComponentProps>
           >
             <div className="flex w-full items-center justify-between">
               <CardTitle className="text-base font-semibold">
-                {componentConfig.rightPanel?.title || "우측 패널"}
+                {activeTabIndex === 0
+                  ? componentConfig.rightPanel?.title || "우측 패널"
+                  : componentConfig.rightPanel?.additionalTabs?.[activeTabIndex - 1]?.title ||
+                    componentConfig.rightPanel?.additionalTabs?.[activeTabIndex - 1]?.label ||
+                    "우측 패널"}
               </CardTitle>
               {!isDesignMode && (
                 <div className="flex items-center gap-2">
-                  {componentConfig.rightPanel?.showAdd && (
-                    <Button size="sm" variant="outline" onClick={() => handleAddClick("right")}>
-                      <Plus className="mr-1 h-4 w-4" />
-                      추가
-                    </Button>
-                  )}
+                  {/* 🆕 현재 활성 탭에 따른 추가 버튼 */}
+                  {activeTabIndex === 0
+                    ? componentConfig.rightPanel?.showAdd && (
+                        <Button size="sm" variant="outline" onClick={() => handleAddClick("right")}>
+                          <Plus className="mr-1 h-4 w-4" />
+                          추가
+                        </Button>
+                      )
+                    : componentConfig.rightPanel?.additionalTabs?.[activeTabIndex - 1]?.showAdd && (
+                        <Button size="sm" variant="outline" onClick={() => handleAddClick("right")}>
+                          <Plus className="mr-1 h-4 w-4" />
+                          추가
+                        </Button>
+                      )}
                   {/* 우측 패널 수정/삭제는 각 카드에서 처리 */}
                 </div>
               )}
@@ -2575,20 +2770,231 @@ export const SplitPanelLayoutComponent: React.FC<SplitPanelLayoutComponentProps>
             </div>
           )}
           <CardContent className="flex-1 overflow-auto p-4">
-            {/* 우측 데이터 */}
-            {isLoadingRight ? (
-              // 로딩 중
-              <div className="flex h-full items-center justify-center">
-                <div className="text-center">
-                  <Loader2 className="text-primary mx-auto h-8 w-8 animate-spin" />
-                  <p className="text-muted-foreground mt-2 text-sm">데이터를 불러오는 중...</p>
-                </div>
-              </div>
-            ) : rightData ? (
-              // 실제 데이터 표시
-              Array.isArray(rightData) ? (
-                // 조인 모드: 여러 데이터를 테이블/리스트로 표시
-                (() => {
+            {/* 🆕 추가 탭 데이터 렌더링 */}
+            {activeTabIndex > 0 ? (
+              // 추가 탭 컨텐츠
+              (() => {
+                const currentTabConfig = componentConfig.rightPanel?.additionalTabs?.[activeTabIndex - 1];
+                const currentTabData = tabsData[activeTabIndex] || [];
+                const isTabLoading = tabsLoading[activeTabIndex];
+
+                if (isTabLoading) {
+                  return (
+                    <div className="flex h-full items-center justify-center">
+                      <div className="text-center">
+                        <Loader2 className="text-primary mx-auto h-8 w-8 animate-spin" />
+                        <p className="text-muted-foreground mt-2 text-sm">데이터를 불러오는 중...</p>
+                      </div>
+                    </div>
+                  );
+                }
+
+                if (!selectedLeftItem) {
+                  return (
+                    <div className="flex h-full items-center justify-center">
+                      <p className="text-muted-foreground text-sm">좌측에서 항목을 선택하세요</p>
+                    </div>
+                  );
+                }
+
+                if (currentTabData.length === 0) {
+                  return (
+                    <div className="flex h-full items-center justify-center">
+                      <p className="text-muted-foreground text-sm">데이터가 없습니다</p>
+                    </div>
+                  );
+                }
+
+                // 탭 데이터 렌더링 (목록/테이블 모드)
+                const isTableMode = currentTabConfig?.displayMode === "table";
+
+                if (isTableMode) {
+                  // 테이블 모드
+                  const displayColumns = currentTabConfig?.columns || [];
+                  const columnsToShow =
+                    displayColumns.length > 0
+                      ? displayColumns.map((col) => ({
+                          ...col,
+                          label: col.label || col.name,
+                        }))
+                      : Object.keys(currentTabData[0] || {})
+                          .filter(shouldShowField)
+                          .slice(0, 8)
+                          .map((key) => ({ name: key, label: key }));
+
+                  return (
+                    <div className="overflow-auto rounded-lg border">
+                      <table className="w-full text-sm">
+                        <thead className="bg-muted/50 sticky top-0">
+                          <tr>
+                            {columnsToShow.map((col: any) => (
+                              <th
+                                key={col.name}
+                                className="px-3 py-2 text-left font-medium"
+                                style={{ width: col.width ? `${col.width}px` : "auto" }}
+                              >
+                                {col.label}
+                              </th>
+                            ))}
+                            {(currentTabConfig?.showEdit || currentTabConfig?.showDelete) && (
+                              <th className="w-20 px-3 py-2 text-center font-medium">작업</th>
+                            )}
+                          </tr>
+                        </thead>
+                        <tbody>
+                          {currentTabData.map((item: any, idx: number) => (
+                            <tr key={item.id || idx} className="hover:bg-muted/30 border-t">
+                              {columnsToShow.map((col: any) => (
+                                <td key={col.name} className="px-3 py-2">
+                                  {formatCellValue(col.name, item[col.name], {}, col.format)}
+                                </td>
+                              ))}
+                              {(currentTabConfig?.showEdit || currentTabConfig?.showDelete) && (
+                                <td className="px-3 py-2 text-center">
+                                  <div className="flex items-center justify-center gap-1">
+                                    {currentTabConfig?.showEdit && (
+                                      <Button
+                                        variant="ghost"
+                                        size="sm"
+                                        className="h-7 w-7 p-0"
+                                        onClick={() => handleEditClick("right", item)}
+                                      >
+                                        <Pencil className="h-3.5 w-3.5" />
+                                      </Button>
+                                    )}
+                                    {currentTabConfig?.showDelete && (
+                                      <Button
+                                        variant="ghost"
+                                        size="sm"
+                                        className="h-7 w-7 p-0 text-red-500 hover:text-red-600"
+                                        onClick={() => handleDeleteClick("right", item)}
+                                      >
+                                        <Trash2 className="h-3.5 w-3.5" />
+                                      </Button>
+                                    )}
+                                  </div>
+                                </td>
+                              )}
+                            </tr>
+                          ))}
+                        </tbody>
+                      </table>
+                    </div>
+                  );
+                } else {
+                  // 목록 (카드) 모드
+                  const displayColumns = currentTabConfig?.columns || [];
+                  const summaryCount = currentTabConfig?.summaryColumnCount ?? 3;
+                  const showLabel = currentTabConfig?.summaryShowLabel ?? true;
+
+                  return (
+                    <div className="space-y-2">
+                      {currentTabData.map((item: any, idx: number) => {
+                        const itemId = item.id || idx;
+                        const isExpanded = expandedRightItems.has(itemId);
+
+                        // 표시할 컬럼 결정
+                        const columnsToShow =
+                          displayColumns.length > 0
+                            ? displayColumns
+                            : Object.keys(item)
+                                .filter(shouldShowField)
+                                .slice(0, 8)
+                                .map((key) => ({ name: key, label: key }));
+
+                        const summaryColumns = columnsToShow.slice(0, summaryCount);
+                        const detailColumns = columnsToShow.slice(summaryCount);
+
+                        return (
+                          <div key={itemId} className="rounded-lg border bg-white p-3">
+                            <div
+                              className="flex cursor-pointer items-start justify-between"
+                              onClick={() => toggleRightItemExpansion(itemId)}
+                            >
+                              <div className="flex-1">
+                                <div className="flex flex-wrap gap-x-4 gap-y-1">
+                                  {summaryColumns.map((col: any) => (
+                                    <div key={col.name} className="text-sm">
+                                      {showLabel && (
+                                        <span className="text-muted-foreground mr-1">{col.label}:</span>
+                                      )}
+                                      <span className={col.bold ? "font-semibold" : ""}>
+                                        {formatCellValue(col.name, item[col.name], {}, col.format)}
+                                      </span>
+                                    </div>
+                                  ))}
+                                </div>
+                              </div>
+                              <div className="ml-2 flex items-center gap-1">
+                                {currentTabConfig?.showEdit && (
+                                  <Button
+                                    variant="ghost"
+                                    size="sm"
+                                    className="h-7 w-7 p-0"
+                                    onClick={(e) => {
+                                      e.stopPropagation();
+                                      handleEditClick("right", item);
+                                    }}
+                                  >
+                                    <Pencil className="h-3.5 w-3.5" />
+                                  </Button>
+                                )}
+                                {currentTabConfig?.showDelete && (
+                                  <Button
+                                    variant="ghost"
+                                    size="sm"
+                                    className="h-7 w-7 p-0 text-red-500 hover:text-red-600"
+                                    onClick={(e) => {
+                                      e.stopPropagation();
+                                      handleDeleteClick("right", item);
+                                    }}
+                                  >
+                                    <Trash2 className="h-3.5 w-3.5" />
+                                  </Button>
+                                )}
+                                {detailColumns.length > 0 &&
+                                  (isExpanded ? (
+                                    <ChevronUp className="h-4 w-4 text-gray-400" />
+                                  ) : (
+                                    <ChevronDown className="h-4 w-4 text-gray-400" />
+                                  ))}
+                              </div>
+                            </div>
+                            {isExpanded && detailColumns.length > 0 && (
+                              <div className="mt-2 border-t pt-2">
+                                <div className="grid grid-cols-2 gap-2">
+                                  {detailColumns.map((col: any) => (
+                                    <div key={col.name} className="text-sm">
+                                      <span className="text-muted-foreground">{col.label}:</span>
+                                      <span className="ml-1">{formatCellValue(col.name, item[col.name], {}, col.format)}</span>
+                                    </div>
+                                  ))}
+                                </div>
+                              </div>
+                            )}
+                          </div>
+                        );
+                      })}
+                    </div>
+                  );
+                }
+              })()
+            ) : (
+              /* 기본 탭 (우측 패널) 데이터 */
+              <>
+                {isLoadingRight ? (
+                  // 로딩 중
+                  <div className="flex h-full items-center justify-center">
+                    <div className="text-center">
+                      <Loader2 className="text-primary mx-auto h-8 w-8 animate-spin" />
+                      <p className="text-muted-foreground mt-2 text-sm">데이터를 불러오는 중...</p>
+                    </div>
+                  </div>
+                ) : rightData ? (
+                  // 실제 데이터 표시
+                  Array.isArray(rightData) ? (
+                    // 조인 모드: 여러 데이터를 테이블/리스트로 표시
+                    (() => {
                   // 검색 필터링
                   const filteredData = rightSearchQuery
                     ? rightData.filter((item) => {
@@ -3018,14 +3424,16 @@ export const SplitPanelLayoutComponent: React.FC<SplitPanelLayoutComponentProps>
                   </div>
                 </div>
               </div>
-            ) : (
-              // 선택 없음
-              <div className="flex h-full items-center justify-center">
-                <div className="text-muted-foreground text-center text-sm">
-                  <p className="mb-2">좌측에서 항목을 선택하세요</p>
-                  <p className="text-xs">선택한 항목의 상세 정보가 여기에 표시됩니다</p>
-                </div>
-              </div>
+                ) : (
+                  // 선택 없음
+                  <div className="flex h-full items-center justify-center">
+                    <div className="text-muted-foreground text-center text-sm">
+                      <p className="mb-2">좌측에서 항목을 선택하세요</p>
+                      <p className="text-xs">선택한 항목의 상세 정보가 여기에 표시됩니다</p>
+                    </div>
+                  </div>
+                )}
+              </>
             )}
           </CardContent>
         </Card>