You should be able to continue a normal, active life. People still swim with an ostomy, so I see no reason why you can't continue to play sports. There's NO restrictions on what you can or can't do after an ostomy :) I want to also talk a bit about the "bags" itself. I was given the one piece. That's all my home care nurses put on me. It was all I knew. Then one day I was in a forum, when someone mentioned the two piece. Wotj the one pieces, you have to drain them, which can be messy, and not to mention, stinky. I switched to a two piece, and never looked back. The advantages are that they are disposable, NO draining needed. With a one piece, when it fills with gas, there's no way to get the gas OUT unless you unwind the bottom of it. With a two piece, you simply lift where it is connected to, and the gas releases, then you snap it back in place. Done. And one last "PLUS", is that the ones I use are like a "mesh" material, and you can't SEE THRU IT! :) So you don't see the "output" :) So you might want to consider the two piece. SO much better! :)
Best of luck with your surgery, and your sports playing! You will be just fine!