Reports that the former Dancing with the Stars contestant was leaving ESPN emerged last week after the network's VP of communications Josh Krulewitz tweeted about her departure.
"Erin Andrews leaving ESPN," he said. "She did great work for us & we made an aggressive offer to keep her. We wish her the best on her next chapter."
Andrews has now confirmed to Sports Illustrated that she is leaving ESPN for Fox Sports.
"This was a difficult move but it was the right move because it's allowing me to do so many things that I probably would not have been able to do had I stayed at ESPN," she said.
"It's a different way to expand my role. I'm not tired yet. I don't want to hang it up. I just need to get better and these were different opportunities that I would not be able to find anywhere but at Fox Sports."
Andrews, who insisted that "this has not been an easy decision at all", is expected to host a new college football show and is also thought to be lined up to work on Fox Sports' coverage of the NFL and MLB.