There is very little if anything you can do to bypass your ISP's firewall. You'd have to be a skilled programmer to come up with a custom solution to handle routing things differently, and would also probably need the people on the other end to also run the same solution.
Is your ISP Comcast? Comcast has a really bad habit of doing these kinds of things. What you should do is try to catch them in a lie. They'll sit there and advertise about how you can go fast, go everywhere, and play your games online using breakneck speeds (that never actually materialize). They'll talk it up and then you can come right at them with a contradiction because you're playing a game that requires ports that were blocked. Normally your local office does the port blocking. This type of contradiction style approach normally works well because they start stumbling over themselves and don't want to be called liars. You'll also want to immediately jump up the chain of command to managers, senior managers, and all that in order to tell and demonstrate to them you are a home user, the service was advertised to be compatible with games, and it's unfair to block these specific (find out the ports Sins uses) ports when used for productive purposes.
Comcast has tried this crap around where I live too. This is one of their favorite tactics. They try to make you have to pay more in order to get the "premium" or "business" package even if you're just a regular joe trying to enjoy what you already paid for. If you bring up their terms and conditions you can generally cite specific clauses and use legal threats as a last resort. Most managers and upper-level managers just let the lawyers write that stuff and don't know it all themselves. If you're not aggressive about getting the ports unblocked then the ISP will ignore you guaranteed.
Hopefully you find a solution. However, not all ISP's are quite so open to complying (Comcast is an absolute pain and I intend to get rid of the ASAP). Sometimes you've really got to get a letter sent in legal-speak if all else fails. College campus ISP's are by far the worst when it comes to complying with requests to open ports despite them raking in the most cash.
Good luck!
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