Receiver Saubert made the decisive two-point play for the Seahawks.
Seattle engineered a stunning fightback to defeat the Rams in overtime, securing their place in the postseason.
Overcoming a sixteen-point hole in the final period, the Seattle squad emerged victorious by a single point at home, registering their fifth straight victory.
While the Los Angeles had become the first to earn a post-season spot earlier on Sunday, the Seattle team booked their return to the postseason after a two-year absence.
With this result, the Seahawks now lead their division's standings with a twelve and three mark, replacing the Los Angeles, who dropped to the number five playoff position with an 11-4 standing.
Signal-caller Sam Darnold had two interceptions but regrouped to deliver two touchdown passes, culminating in the tying score to star receiver Smith-Njigba in the extra period.
The Rams held a 13-7 lead at half-time before Kenneth Walker III burst through for a 55-yard scoring dash for the home side.
Rams defensive back Wallace then returned Darnold's initial interception for a big return, setting up a one-yard touchdown by Blake Corum on the next play.
In the final stanza, a touchdown from Matthew Stafford to Puka Nacua extended the advantage to sixteen points, but Rashid Shaheed ignited Seattle's comeback with a 58-yard punt return.
Darnold then connected with AJ Barner in the endzone, and a successful two-point play sent the game into an extra period.
Although Nacua raced in for his another TD in OT, Smith-Njigba answered in kind to set up the decisive score.
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