Sterling became the first African-American to win Golden Globe trophy for his role of Randall Pearson on the show.
Ventimiglia later confirmed that he took a plunge while attending the afterparty at the Beverly Hilton in Beverly Hills, California.
"Congratulations Sterling. Excited. And everyone else, great night. Good time at the Globes tonight," Ventimiglia, 40, said in the video after he returned home.
"I'm back home, I'm studying for tomorrow. And yes, I fell in the pool," he said in the video.
NPR's Eric Deggans tweeted that he saw the actor slip and fall into the uncovered portion of the pool.
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