Adama Bojang scored the game’s only goal in the match after capitalizing from an open defence to sweep it home in the 8 minutes of the first period.
The Gambian side, who, despite finishing the game with 10-men, become the only team in the competition yet to concede a goal.
The Gambia U-20, who have one of the best defensive lines in the tournament will now play their neighbours Senegal in the final of the competition.