I travel to Munich fairly regularly. There are some sports bars that you can catch games since Germans are pretty big on NFL action believe it or not. The bar I've liked the most is attached to the Marriott hotel in Nordfriedhof. Super easy to get to using their U-Bahn subway system and solid food. The bar is called Champions and regularly carries NFL games on large projector screens. I'm sure there are plenty of other spots but this is the one I've been to.
Biggest issue with watching games in Germany is the 6 hour time difference. Very hard to catch anything other than the 1pm games unless you're a night owl.
Anyways, enjoy Munich and let me know if you have other questions!