Student Exchange Programs

I am a foreign exchange student in Vigo Spain and I would love to go to Sevilla on February 16-21. e main hubs for travel nearest us is santiago spain and Oporto Portugal.
The train ride from santiago to Sevilla is like 24 hours because you have to go through madrid:/ is there a way we could travel to to oporto, then to sevilla by a portuguese train or something?
thank you