Soloway has confirmed the news in a statement to Deadline, revealing she can't wait to get started on the comic book blockbuster, which previously hit the big screen with Brigitte Nielsen as its star.
"Exploring this powerful mythology and evolving what it means to be a heroine is an artistic dream come true," the filmmaker says, revealing she has already started the search for her leading lady.
Red Sonja began life as a comic book heroine in the 1970s.
Millennium Films bosses have been trying to revive "Red Sonja" for over a decade, with director Robert Rodriguez and his former girlfriend Rose McGowan on board for the project at one point.
Singer was announced as the director last year (2018) after he was fired from "Bohemian Rhapsody". He was dropped after he was accused of sexual assault in an article for The Atlantic. The filmmaker has denied the allegations.