Harper joins Asante Blackk, Kylie Rogers, Clifton Collins Jr., Michael Gandolfini, Josh Hamilton and Brooklynn MacKinzie in the film, titled Landscape With Invisible Hand.
The movie is based on a novel by M.T. Anderson of the same name, set in an alien future.
It is Finley's third film, and is being produced by MGM, Plan B Entertainment and Annapurna Pictures.
The film is currently in production, but no other details or a release date have been revealed yet.
Harper has had a busy few years since the end of NBC's The Good Place in 2020, having starred in and executive produced the second season of HBO Max's romcom anthology Love Life.
He also appeared in Amazon's The Underground Railroad and in the indie rom-com We Broke Up opposite Aya Cash.
More recently, he was announced as the lead of the upcoming comedic thriller series The Resort with How I Met Your Mother's Cristin Milioti.
The Resort is from the creator behind Mr Robot, with Harper and Milioti starring as married teachers Noah and Emma who visit a resort in Hawaii and find themselves caught up in an unsolved mystery from 15 years earlier.
On The Good Place, Harper played the philosophical Chidi, who was also a love interest to Kirsten Bell's character and friend to Jameela Jamil's character.
Harper recently revealed that he would love to return to Love Life if given the opportunity, saying: "It's a great set. Everyone's really great. I love it and I would be back in a heartbeat."
He took over from Anna Kendrick in season one, but Kendrick appeared in some episodes of season two, with creator Sam Boyd keen to have "small ways" to "connect it back" to previous seasons.
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