These are good questions. Your son is still a sophomore, so first, I would say, see how things evolve for him. Is he making music at home, with computer, or with other equipment? What software program is he using? Is he posting on YouTube?
Some students who do this kind of work do end up at conservatory, getting a foundation in composition. If that were a possible route, he could start working with a teacher (who has some interest in electronics etc.) and try to go to summer programs, such as Oberlin’s Sonic Arts. He could consider many conservatories for a traditional music education and then branch out. Some are part of a university or college, where aid might be more available.
There are also conservatories like Berklee, Miami Frost, Belmont that focus on contemporary music.
And programs in electronic or computer music, studio production, music technology, audio engineering, music production…so many terms that it can be quite confusing. Berklee, Northeastern, UMass Lowell are schools near me that I know about.UMichigan has the PAT program. Ithaca, Hartt, there are many others. Possibly CalArts. Also any school that has film scoring perhaps, so might add SUNY Purchase, North Carolina School of the Arts, a few others. USC has a grad program in film scoring to which undergrads are assured admission, I believe, after “getting a foundation.”
Some go to college. You are right it is not necessary to get a degree in this specifically, necessarily, but I would recommend looking at resources and courses regardless of major. I also would look at schools like Bennington, where students do electronic music in a liberal arts context, and at that school, like some others, there is a lot of independent work.
A music school or conservatory will offer a BM degree, which will involve 2/3-3/4 courses in music. A BA will be more like 1/4-1/3 music, often with required distribution requirements. If you think he would prefer the BM, the discussion could be narrowed.
I would say that almost any school will have a studio where he can do this work. So the question is, how narrow does he want his focus to be at the undergrad level? The broadest way to go is a BA, perhaps, or a BM with a classical foundation. The most focused way to go is a specific program for video game composing, which, I am sure, is available somewhere. If that is what he wants, this forum can most likely find some programs. But he is young and may change his mind in the next two years!
Of course, he can always continue doing this on his own. And major in something else. Or not go to college at all for that matter!!