The notoriously media-averse NFL star, who barely spoke to reporters at Media Day in January, said he's "just trying something new."
The film, titled Family First, will follow Lynch from childhood through to February's Super Bowl win.
"I'm more than ready to play myself," he said. "I got the acting bug when I played a small role in Matt's Chance starring Gary Busey.I definitely want to expand my opportunities after football. I've also been on a couple TV shows, so I'm not nervous."