We're told the dude in the front of the line won the "Tiger" role in a movie starring real-life Woods mistress Joslyn James -- but the winner won't get to sink his putts ... he's merely there to act.
Sources at Vivid Entertainment -- the company behind the porn -- tell TMZ the Tiger-alike will be used in several non-nude interstitials throughout the flick ... and they'll be calling in "professionals" to fill in the gaps.