If you mean by using a normal cassette / reel recorder, forget it: the projector and the recorder will always go out of synch after a minute or two. In the past, there have been made some 8mm projectors that had a built-in reel tape player, but I would rule out this solution as well. They were hard to find, operate and keep "in tune" even back then, go figure today.
Getting a super8 cine camera with sound and projector is by far the easiest solution in my opinion.