Tight end Saubert executed the game-winning two-point conversion for the Seahawks.
Seattle staged a stunning fightback to overcome the Rams in overtime, securing their spot in the postseason.
Rallying from a sixteen-point deficit in the fourth quarter, the Seattle squad triumphed by a single point at home, registering their fifth straight victory.
While the Rams had already secured a playoff berth earlier on game day, the Seahawks secured their place to the play-offs after a 24-month hiatus.
With this result, the Seahawks have taken over their division's race with a twelve and three mark, supplanting the Rams, who dropped to the number five playoff position with an 11-4 record.
Quarterback Sam Darnold threw two picks but recovered to make two scoring throws, culminating in the second score to wideout Smith-Njigba in the extra period.
The visitors held a 13-7 lead at the break before Kenneth Walker III broke free for a long touchdown run for Seattle.
Los Angeles cornerback Josh Wallace then took back Darnold's initial interception for a big return, leading to a one-yard score by Corum on the ensuing snap.
In the fourth quarter, a touchdown from Matthew Stafford to Puka Nacua extended the advantage to 30-14, but Rashid Shaheed ignited Seattle's comeback with a spectacular return for a score.
Darnold then found Barner in the end zone, and a successful conversion forced the contest into overtime.
Although Nacua raced in for his second touchdown in OT, Smith-Njigba answered in kind to set up the decisive conversion.
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