South Kingstown scored on its first three possessions and the fourth seeded Rebels never looked back as they advanced to the Division II Super Bowl with a 21-7 victory over top-seeded Shea.
Tim Hazard opened the South Kingstown 21-point first quarter, scoring on a 1-yard touchdown run.
Sean Hamill made it 14-0 on a 60-yard run and Josh Ponte added a 53-yard run.
South Kingstown ran for 334 yards with Ponte going for 114, Hamill 102 and Hazard 68.
South Kingstown's defense held Shea to 96 yards of total offense and forced four Raider turnovers. South Kingstown had seven sacks, four from Jay Dorsey, and Patrick Gee had a pair of second half interceptions.
Akeem Williams scored Shea's touchdown in the fourth quarter on a 15-yard pass from Albert Amado.
South Kingstown will play third-seed Toll Gate in the Super Bowl.