Tight end Saubert executed the game-winning two-point conversion for Seattle.
Seattle staged a stunning fightback to defeat the Rams in overtime, clinching their spot in the postseason.
Overcoming a sixteen-point deficit in the fourth quarter, the Seattle squad emerged victorious 38-37 at home, registering their fifth consecutive win.
While the Rams had become the first to earn a post-season berth earlier on Sunday, the Seahawks secured their place to the play-offs after a 24-month absence.
With this result, the Seattle now lead their Conference race with a twelve and three mark, supplanting the Los Angeles, who dropped to the fifth playoff position with an eleven and four standing.
Signal-caller Sam Darnold threw two interceptions but recovered to deliver two touchdown passes, culminating in the second TD to wideout Smith-Njigba in overtime.
The visitors held a six-point lead at half-time before Kenneth Walker III broke free for a 55-yard scoring dash for Seattle.
Rams defensive back Wallace then took back Darnold's first interception for a big return, setting up a short score by Corum on the ensuing snap.
In the final stanza, a scoring pass from Matthew Stafford to Puka Nacua extended the advantage to sixteen points, but Shaheed ignited the hope with a 58-yard return for a score.
Darnold then connected with AJ Barner in the endzone, and a successful conversion forced the game into overtime.
Although Puka Nacua scored for his second TD in overtime, Smith-Njigba responded in kind to setup the decisive score.
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