Hi I would either use the Motivation and Engagement Scale by Martin (2007) or the Motivation scale by Vallerand et al. You could look these up. Each has a differing conceptual basis. In my mind as a former CEO of Paralympic Sport, and depending on your research question, you should measure this in the right way depending upon the 'context' e.g., an athlete enquiry, a person with disability and their involvement enquiry, an organisational enquiry etc.