There is a direct train from Barca to Perp but I would have a look at avaliablity before you get there, we foolishly assumed it wouldn't be sold out and ended up on the longest train journey ever known to man.

Unless you drive it, it is not possible to get there and back in the day.

There are only a couple of long distance international trains from Barcelona in to France each day, roughly one in the morning and one late afternoon / evening. The latter would probably mean that you missed the game.

Google 'Seat 61' for details of how to obtain tickets / train times etc.

It's not as cheap as you might think either ....