I made a post about this same kind of game earlier in the year, when the weather was starting to become more accommodating. Just did a quick look for it, but couldn't find it....basically the same as the game you described. I only played it once, and managed to get pretty drunk while doing so, so my recollection of the exact rules is kind of foggy.
In the version I played, it was at the beach and we just used whatever sticks we could find (I think one of them was a tiki torch though). They were more like 10m apart though. And the scoring seemed similar, but I think we also integrated "drinks" into it...and I think you could reverse the drinks on people. For example, if you knocked the can off the pole, that was a point for your team and the other team had to take a drink. If the other team caught the can though, then YOUR team had to drink. I think as far as the points go though, if the can was caught, it nullified any points made, regardless if it hit the pole or can (we had to use cans and not bottles since we were on the beach).
As far as what the game was actually called, nobody really knew, but the guy that introduced it to us called it "Hippie Horseshoes", just b/c he didn't know what it was called and that seemed like a good name to him.
Definitely a fun game though, would love to play it again.