The person familiar with his plans spoke on the condition of anonymity because neither "Saturday Night Live" nor the campaign was prepared to announce Sanders’s appearance.
Sanders’s Democratic rival, Hillary Clinton, appeared on the show in October, in a sketch in which she played a bartender who commiserated with Clinton as played by the show’s cast member Kate McKinnon.
Republican candidate Donald Trump has also appeared on SNL.
Both Sanders and Clinton are spending the majority of their days in New Hampshire in advance of Tuesday’s Democratic primary, in which polls show Sanders with a sizable lead. Sanders is expected to return to the state by Sunday to resume campaigning.