Sport bar is good, if a bit small - but you need never miss a football match! Try some of the organised pub crawls, if you do one early on you'll find lots of good bars and clubs. I can't be specific as it was 12 months ago and I was drunk, but I vaguely remember having a really good time
There are a number of clubs in bansko. Wander through the streets towards the center of the town and you will find them easily enough after 11.00 O'Clock when they open up and have their neon lights illuminated