Sevilla FC's ground is about a mile due east of the central cathedral area of Seville. You can probably walk it in about 30 minutes. The team plays at the 45,500-seater Stadium "Ramón Sánchez Pizjuán." The club website has a section for ticketing ("taquilla"), but for some reason I couldn't see any links to purchase online. There is a number listed (902-51-00-11), so you could try that if you want to speak to someone about seating and prices, I guess. Plenty of other outlets sell La Liga tickets online, which range in price depending on the team's opponents. Your other option might be to try buy something at the ground on gameday, though there's no guarantee you'll get something. Enjoy Sevilla. It's a great town. I was there just before Semana Santa a few years ago and the place was hopping. There's some great little tapas bars in the old Jewish quarter, Barrio Santa Cruz. Also, you should climb to the top of the cathedral tower for great views of the city. The tour of the bull ring is quite interesting, too, even if bullfighting isn't your thing.