This study systematically explored the outcomes and implementation processes of the School Sport Leadership Program (SSLP), which was integrated into some secondary schools in Melbourne, Australia. The main principle behind the SSLP was to train secondary school-aged students to become sport leaders, who deliver sporting activities to primary schools with the aim to encourage participation in sports and physical activities and develop their competencies. The overarching aim of this research was to evaluate the impact of the program utilising rigour methodology design, and to provide a comprehensive view of the developmental outcomes for the young people, as well as the program’s impact on the school community.