Emerging Nomads beat Castletown 31-24 in the Shimmin Wilson Manx Bowl at Poulsom Park.
It was a disappointing finale to the season for Castletown, who picked up tries from Mark Venables, Barry Irvine and a penalty try.
Sam Peel kicked three conversions and a penalty for Town.
Tributes paid to 'legend' Eric Bregazzi
Family confirms passing of major Manx sporting figure
Powerlifting: Isle of Man squad confirmed for 2026 Home Nations
Island will host event for the first time later this month
Badminton: Mixed starts for Island sides at county championships
Both teams claim a win and a loss on the road
Josh Brookes leaves DAO Racing
Australian claimed TT podium with team this year