People with disabilities consistently advocate for their right to be self-determined. Decades of research highlight the positive impacts of self-determination intervention on in-school and post-school outcomes of secondary students with disabilities. Increasingly, self-determination interventions are being implemented in inclusive contexts for "all" students, including students with and without disabilities. To enable implementation with high fidelity, further examination of the supports needed by teachers is required. In this study, the authors examine the impacts of differing intensities of teacher implementation supports (online modules only vs. online modules + coaching) on the initiation of the self-determined learning model of instruction (SDLMI) by schools and teachers and outcomes for students that arise from more intensive implementation when schools and teachers do initiate. Results suggest that intensifying teacher implementation supports has a positive impact on a cascading series of outcomes for schools, teachers, and students. In this study, the authors discuss the implications of the results for future research and practice.