Receiver Saubert made the game-winning two-point conversion for the Seahawks.
Seattle engineered a remarkable fightback to overcome the Rams in extra time, securing their place in the postseason.
Rallying from a sixteen-point deficit in the final period, the Seahawks triumphed 38-37 at home, registering their fifth consecutive victory.
While the Rams had already secured a playoff spot earlier on Sunday, the Seahawks secured their place to the postseason after a 24-month absence.
With this result, the Seattle have taken over their division's standings with a twelve and three record, replacing the Los Angeles, who dropped to the fifth seed with an 11-4 record.
Signal-caller Sam Darnold threw two interceptions but recovered to make two touchdown passes, including the second score to wideout Smith-Njigba in overtime.
The Rams held a 13-7 advantage at the break before Kenneth Walker III burst through for a 55-yard scoring dash for the home side.
Los Angeles defensive back Wallace then took back Darnold's first pick for 56 yards, leading to a short touchdown by Corum on the next play.
In the final stanza, a scoring pass from Matthew Stafford to Nacua pushed the advantage to sixteen points, but Shaheed provided Seattle's comeback with a spectacular punt return.
Darnold then connected with AJ Barner in the endzone, and a successful conversion sent the game into an extra period.
Although Nacua raced in for his another TD in overtime, Jaxon Smith-Njigba answered in kind to setup the game-winning score.
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