The purpose of this study was to investigate the role of self-confidence on the sports success of students participating in volleyball leisure activities. The present study was applied in terms of purpose and descriptive-correlational based on structural equation modeling in terms of type, the information of which was collected by questionnaires. The statistical population of the research included students participating in volleyball classes in the city of Mashhad. In this regard, 200 questionnaires were distributed and after collecting and removing the incomplete questionnaires, 160 of them were selected and entered the analysis stage. In order to collect data in this study, three standard questionnaires of sports success (Mousavi and Vaez Mousavi, 2015), sources of sport-confidence (Vealey et al., 1998) and various types of sport-confidence (Vealey and Knight, 2002) were used. The results showed that there is a significant relationship between sources of sport-confidence and its components and the various types of sport-confidence and its components with sports success and the components of these two variables predict changes in sports success. Finally, the structural equation model had a good fit between the resources and types of sports self-confidence and sports success. Therefore, it can be said that having an appropriate amount of sources and types of sport-confidence, can lead to sports success for students participating in leisure classes in volleyball and generally in sports.