Receiver Saubert executed the decisive two-point conversion for Seattle.
Seattle engineered a stunning comeback to overcome the Rams in overtime, clinching their place in the postseason.
Rallying from a 30-14 hole in the final period, the Seahawks emerged victorious 38-37 at home, registering their fifth straight win.
While the Rams had already secured a playoff berth earlier on game day, the Seattle team booked their return to the play-offs after a two-year hiatus.
With this outcome, the Seattle have taken over their Conference standings with a 12-3 mark, replacing the Los Angeles, who fell to the fifth seed with an eleven and four record.
Quarterback Sam Darnold had two interceptions but regrouped to make two scoring throws, including the tying TD to star receiver Smith-Njigba in overtime.
The visitors held a 13-7 lead at half-time before Kenneth Walker III burst through for a long scoring dash for the home side.
Rams defensive back Wallace then took back Darnold's initial pick for a big return, setting up a short score by Corum on the next play.
In the final stanza, a touchdown from Matthew Stafford to Nacua pushed the advantage to 30-14, but Shaheed provided Seattle's comeback with a spectacular punt return.
Darnold then connected with Barner in the endzone, and a successful conversion sent the game into an extra period.
Although Puka Nacua raced in for his second touchdown in OT, Smith-Njigba responded in kind to set up the decisive score.
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