Tight end Saubert executed the game-winning two-point play for Seattle.
The Seattle Seahawks engineered a stunning fightback to defeat the Rams in extra time, clinching their place in the postseason.
Rallying from a 30-14 hole in the fourth quarter, the Seattle squad triumphed 38-37 at home, notching their fifth consecutive win.
While the Rams had become the first to earn a post-season spot earlier on Sunday, the Seahawks booked their return to the play-offs after a 24-month hiatus.
With this result, the Seattle have taken over their Conference race with a twelve and three mark, replacing the Rams, who fell to the number five seed with an 11-4 standing.
Quarterback Darnold threw two interceptions but recovered to make two touchdown passes, including the tying TD to star receiver Smith-Njigba in the extra period.
The Rams held a six-point lead at the break before Kenneth Walker III burst through for a 55-yard scoring dash for the home side.
Los Angeles defensive back Josh Wallace then returned Darnold's first pick for 56 yards, leading to a one-yard score by Blake Corum on the next play.
In the fourth quarter, a scoring pass from Matthew Stafford to Puka 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 conversion forced the contest into an extra period.
Although Nacua raced in for his second TD in overtime, Smith-Njigba responded in kind to setup the decisive score.
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