Websites such as the American Physical Therapy Association's "Find a PT" directory. This directory allows you to search for therapists by location, specialty, and other criteria.
In addition to using online directories, you can also ask friends, family, or other healthcare providers for recommendations. Your attorney may also recommend a physical therapist. You can also contact your insurance company to find out if they have a list of in-network physical therapists who are covered by your plan. Once you have a few options, you can research the therapists' credentials, experience, and areas of specialization to find the right one for your needs.