The Stay With Me hitmaker was unable to attend the U.S. network's annual prizegiving, which celebrates the best music and movies by African-Americans and other minorities over the past year.
The Brit beat out the likes of rappers Dej Loaf, Fetty Wap, Rae Sremmurd and R&B singer Tinashe for the prize, and audience members were stunned to see Anderson, who emceed the event, appear from the crowd in a sharp suit and brown wig similar to Smith's hairstyle.
The actor then changed the lyrics to Smith's hit song Stay With Me, and sang, "This award is going to Stay With Me - for you not showing up to BET. Although this trophy is really yours, it's going to stay with me."
He continued, "Sam Smith, congratulations on this much deserved (win). You can come by my house next week and pick it up - but call first because black folks don't just be showing up to people's house like that (sic)."