He will be unveiled at a press conference at 4.00pm today (Mon).
The New Zealander joined Leinster from Clermont Auvergne in 2010, and led the Dublin province to back-to-back Heineken Cup titles.
It has been reported that Schmidt has signed a three-year deal with the Irish Rugby Football Union.
He will join the national squad at the end of the season. Leinster have already qualified for the Amlin Challenge Cup final and RaboDirect PRO12 play-offs.