Evans lost out to Hope in the final of Andrew Lloyd Webber's talent show earlier this year. However, it has now been confirmed that Evans will fill in for Hope during holiday weeks in May and September next year.
The Welsh performer will appear as Dorothy in the weeks beginning May 2, September 5 and September 12. She is also taking a one-year musical theatre training course, which is being funded by Webber.
Fellow Rainbow finalists Lauren Samuels and Steph Fearon have gone on to land West End roles in Grease and Smokey Joe's Cafe respectively.
Andrew Lloyd Webber's new Wizard Of Oz opens on March 1, 2011.