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Blasters, who have 30 points from 19 games and currently in fifth spot, are assured of a top-six finish.
Wilmar Jordan Gil scored in the 63rd minute in a 1-0 win for Punjab.
The Blasters lost 1-3 with Wilmar Jordan scoring a brace.
The reigning I-League champions have fulfilled the criteria to join the nation's premier men's football league.
Punjab crushed Rajasthan United 4-0 to seal the title with a match to spare.
Gokulam went down 0-1 after their former player's goal in the away fixture in Panchkula.
With this result, Punjab FC remain in second place on the league table with 22 points in 14 matches -- 10 points behind leaders Mohun Bagan.
Aser Dipanda scored a brace for the winners.