diff --git a/src/main/java/com/codiary/backend/global/apiPayload/code/status/ErrorStatus.java b/src/main/java/com/codiary/backend/global/apiPayload/code/status/ErrorStatus.java
index b1b248d0..41880dd0 100644
--- a/src/main/java/com/codiary/backend/global/apiPayload/code/status/ErrorStatus.java
+++ b/src/main/java/com/codiary/backend/global/apiPayload/code/status/ErrorStatus.java
@@ -36,7 +36,7 @@ public enum ErrorStatus implements BaseErrorCode {
     TEAM_NAME_NOT_EXIST(HttpStatus.BAD_REQUEST, "TEAM_2002", "팀 이름입력은 필수 입니다."),
     TEAM_ALREADY_EXISTS(HttpStatus.CONFLICT, "TEAM_2003", "이미 존재하는 팀입니다."),
     TEAM_ADMIN_UNAUTHORIZED(HttpStatus.BAD_REQUEST, "TEAM_2004", "관리자 권한이 없습니다."),
-
+    TEAM_MEMBER_ALREADY_EXISTS(HttpStatus.CONFLICT, "TEAM_2005", "이미 존재하는 팀원입니다."),
     // 포스트 관려 에러 3000
     POST_CREATE_UNAUTHORIZED(HttpStatus.BAD_REQUEST, "POST_3001", "포스트 생성 권한이 없습니다."),
     POST_UPDATE_UNAUTHORIZED(HttpStatus.BAD_REQUEST, "POST_3002", "포스트 수정 권한이 없습니다."),
diff --git a/src/main/java/com/codiary/backend/global/service/TeamMemberService/TeamMemberCommandServiceImpl.java b/src/main/java/com/codiary/backend/global/service/TeamMemberService/TeamMemberCommandServiceImpl.java
index e1e27b84..3fabdc6a 100644
--- a/src/main/java/com/codiary/backend/global/service/TeamMemberService/TeamMemberCommandServiceImpl.java
+++ b/src/main/java/com/codiary/backend/global/service/TeamMemberService/TeamMemberCommandServiceImpl.java
@@ -24,6 +24,9 @@ public class TeamMemberCommandServiceImpl implements TeamMemberCommandService {
   private final TeamMemberRepository teamMemberRepository;
 
   public TeamMember addMemberToTeam(Member member, Team team, MemberRole role) {
+    if(teamMemberRepository.findByTeamAndMember(team, member).isPresent()) {
+      throw new GeneralException(ErrorStatus.TEAM_MEMBER_ALREADY_EXISTS);
+    }
     TeamMember teamMember = TeamMember.builder()
         .team(team)
         .member(member)