According to Singer, He Wasn't In Hawaii During Alleged Assault

Bryan Singer believes he has proof that will blow his sexual accuser out of the water ... he was NOT in Hawaii during the period he allegedly committed a sexual assault.

Michael Egan claims in a new lawsuit Singer anally raped him and forced hard drugs on him during 2 separate trips to Hawaii in August and October, 1999.

Sources connected with Singer tell TMZ ... the "X-Men" director has proof he was NOT in Hawaii during that period ... he was in Toronto shooting the first "X-Men" movie.

We're told Singer will file credit card bills and various other documents proving he was in Toronto during the times in question.

We know the movie itself was shot Sept. 22 - March 3 in Toronto, but there was pre-production and we're told Singer was present.