Former Wales hooker Jonathan Humphreys was hired as Scotland forwards coach on Monday.
Humphreys signed a two-year contract with the Scottish Rugby Union and will leave his role at Ospreys, where he also coaches the forwards, at the end of the season.
The 44-year-old will replace former England forward Dean Ryan, who quit after a short-term stint working with interim head coach Scott Johnson during this year's Six Nations.
Humphreys will join the Scotland coaching staff ahead of the tournament with Samoa, South Africa and Italy in June.
He worked with Johnson for a spell when the Australian was employed by Ospreys as director of rugby from 2009 before moving to Scotland to assist former head coach Andy Robinson last year.
"I'm very excited by the challenge of working with the Scotland players and management and building on the very solid foundations that are in place," Humphreys said.
"I know Scott well from our time together at the Ospreys and it will be great to renew acquaintance with a man who has such a sharp rugby brain."