The purpose of this study was to develop and apply a team building program for a curling team through needs assessment. The participants in this study were 69 high-school, college, professional, and national curling athletes for the needs assessment, 4 sport psychologists and 2 curling experts for verifying the validity of the program, and 5 curling athletes of professional curling teams for the application of the team building program. The needs assessment data were analyzed by inductive content analysis. The team building program was developed based on the results of needs assessment, goal setting of the team building program, and a selection of activities for the team building program. The team building program was applied to five curling players for 7 sessions. Team cohesion, team efficacy, and effective communication were measured two times (i.e., pre and post) to examine the effects of team building intervention. The results of needs assessment indicated interpersonal relationship, communication, and performance were necessary factors for team building. Consequently, goals of the team building program were to improve communication and interpersonal relationships. Team building activities were selected through team building literature review and expert meetings. Secondly, the team building intervention had a positive influence on team cohesion, team efficacy, and communication. These results indicated that team building would positively contribute to team factors and team performance.