Receiver Saubert executed the game-winning two-point conversion for the Seahawks.
Seattle engineered a remarkable fightback to overcome the Rams in extra time, securing their spot in the postseason.
Rallying from a sixteen-point deficit in the final period, the Seattle squad triumphed by a single point at home, notching their fifth consecutive victory.
While the Los Angeles had become the first to earn a post-season berth earlier on Sunday, the Seattle team secured their place to the play-offs after a 24-month absence.
With this outcome, the Seattle now lead their division's standings with a 12-3 mark, supplanting the Rams, who fell to the number five playoff position with an 11-4 record.
Signal-caller Darnold threw two picks but recovered to make two touchdown passes, including the second TD to star receiver Smith-Njigba in the extra period.
The visitors held a six-point advantage at half-time before Walker broke free for a 55-yard touchdown run for the home side.
Los Angeles defensive back Wallace then took back Darnold's initial interception for a big return, setting up a short touchdown by Blake Corum on the next play.
In the final stanza, a scoring pass from Matthew Stafford to Nacua pushed the advantage to 30-14, but Rashid Shaheed provided the comeback with a 58-yard return for a score.
Darnold then connected with Barner in the endzone, and a converted two-point play sent the game into an extra period.
Although Puka Nacua raced in for his second TD in overtime, Jaxon Smith-Njigba answered in kind to setup the decisive conversion.
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