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.
Athletics: David Mullarkey in GB squad for European team championships
Island athlete to contest 5,000m race in Madrid later this month
Boxing: Sam Rennie not ruling out further title push this year
Manxman hoping to build on recent WBC title victory
Shooting: Kirkpatrick tops the chart in latest skeet league meeting
League stage winner also enjoys cup success at Meary Veg
Fundraiser launched to help injured TT rider with recovery
Mark Parrett could need 'several specialized treatments'