Some of the reputable schools do offer an online or independent learning option for the “book-learning” part of the education.
However, you simply cannot learn a kinectic/tactile skill like massage without in-person supervision and training by an expert. If you want to do this as a career and work on others’ horses, even just a sideline, you really should get the best possible education.
Yes, it is costly and time-consuming to have to travel. The better courses of study are longer and do cost more … but you really do get what you pay for. If you want to be a good therapist, you should resign yourself to the idea of having to take a few trips for some of the hands-on study.
Where in TN are you located? At least one of the strongest schools does offer its in-person training in varied locations. One of my classmates was from the Maryville area and traveled for the three required in-person sessions to graduate with our basic certification. She did not find it onerous. My family is in Bristol, and I have some regular clients in that area; it is about 4 hours away from my (I am now local to my massage school and help teach there).