Evans, who coaches at Premiership club Harlequins, comes into a new coaching set-up after Steve Borthwick was named Eddie Jones' successor in December.
BBC reports Martin Gleeson had held the attack position under Jones and no update has been given on his future with England.
"Nick brings with him a wealth of different experiences as a player and coach," Borthwick said.
"We'd particularly like to thank Harlequins for their support in allowing Nick to work with us during this period. It's a great example of club and country working together."