Sports medicine physical therapist?

Hey, so I want to be a physical therapist in sports medicine. I heard about one therapist who specialized in a certain sport,gymnastics, and almost did rounds to different gymnastics facilities 2 times a week to check out any gymnasts with pain. They then on the other three days had there physical therapy building where they referred gymnasts if there injury was bad and needed further therapy. I am really interested in doing that. Is that do-able. What would I have to do to achieve that