Tight end Saubert made the decisive two-point play for the Seahawks.
Seattle engineered a stunning comeback to defeat the Rams in extra time, clinching their spot in the postseason.
Overcoming a 30-14 hole in the final period, the Seahawks triumphed 38-37 at home, registering their fifth straight win.
While the Rams had become the first to earn a playoff spot earlier on Sunday, the Seattle team secured their place to the play-offs after a 24-month hiatus.
With this outcome, the Seattle have taken over their division's race with a 12-3 record, replacing the Los Angeles, who dropped to the fifth playoff position with an eleven and four record.
Quarterback Darnold threw two picks but recovered to make two touchdown passes, including the tying score to star receiver Smith-Njigba in the extra period.
The visitors held a six-point lead at the break before Kenneth Walker III broke free for a long scoring dash for Seattle.
Los Angeles defensive back Josh Wallace then returned Darnold's initial interception for a big return, leading to a short score by Corum on the ensuing snap.
In the fourth quarter, a scoring pass from Matthew Stafford to Puka Nacua extended the advantage to sixteen points, but Rashid Shaheed provided Seattle's hope with a 58-yard punt return.
Darnold then found Barner in the end zone, and a successful two-point play sent the contest into an extra period.
Although Puka Nacua raced in for his another TD in overtime, Smith-Njigba responded in kind to set up the decisive conversion.
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Elizabeth Petty
Elizabeth Petty
Elizabeth Petty