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I would recommend going to your local physical therapy center or physician's clinics and inquire if their physical therapist or physician is interested in providing shadowing opportunity or have any internships opportunities available.
Yes, it is difficult to find it from the internet. But if you go there and ask personally, you might have more chances getting it directly from them. Otherwise, there is a website (that I know) where you can look for internships opportunities.
Here's the link:
If not, you can also look for indeed.com or similar job search websites where sometimes they would look for candidates for internship opportunities too.