The blurry five-minute video shows a nude blonde woman standing in front of a hotel room mirror. It's unknown when or where it was shot.
Andrews' lawyer, Marshall Grossman, says the 31-year-old reporter plans to seek criminal charges and file civil lawsuits against the unknown cameraman and anyone who publishes the material.
"While alone in the privacy of her hotel room, Erin Andrews was surreptitiously videotaped without her knowledge or consent," Grossman said in the statement. "She was the victim of a crime and is taking action to protect herself and help ensure that others are not similarly violated in the future."
A woman answering the phone Tuesday at Grossman's office said he would have no further comment.
Andrews has covered hockey, college football, college basketball and Major League Baseball for the network since 2004, often as a sideline reporter during games.
A former dance team member at the University of Florida, Andrews was something of an Internet sensation even before the video's circulation. She has been referred to as "Erin Pageviews" because of the traffic that video clips and photos of her generate, and Playboy magazine named her "sexiest sportscaster" in both 2008 and 2009. She last appeared on the network as part of its ESPY Awards broadcast on Sunday, and is scheduled to be off until September.
-- The Associated Press