Receiver Saubert made the game-winning two-point play for the Seahawks.
Seattle engineered a remarkable fightback to overcome the Rams in overtime, clinching their place in the NFL play-offs.
Overcoming a sixteen-point deficit in the final period, the Seahawks emerged victorious by a single point at home, registering their fifth consecutive win.
While the Los Angeles had already secured a post-season spot earlier on game day, the Seahawks booked their return to the play-offs after a 24-month absence.
With this outcome, the Seahawks have taken over their Conference race with a twelve and three mark, replacing the Los Angeles, who dropped to the number five playoff position with an 11-4 record.
Quarterback Darnold had two interceptions but recovered to deliver two touchdown passes, including the second score to wideout Smith-Njigba in overtime.
The visitors held a 13-7 lead at half-time before Walker burst through for a long scoring dash for Seattle.
Rams defensive back Wallace then took back Darnold's initial pick for a big return, setting up a one-yard score by Corum on the ensuing snap.
In the fourth quarter, a touchdown from Matthew Stafford to Nacua extended the Rams' lead to 30-14, but Shaheed provided Seattle's hope with a spectacular return for a score.
Darnold then found Barner in the end zone, and a converted two-point play sent the contest into overtime.
Although Puka Nacua raced in for his another touchdown in overtime, Smith-Njigba responded in kind to setup the decisive conversion.
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