The Christchurch-born Borlase is a well-regarded tighthead prop in New Zealand rugby, and will join Munster on a two-year contract. The 6ft 3in, 18 stone front rower can also play at loosehead.
Aged 25, Borlase made his Canterbury debut against South Canterbury in 2006 and has 20 provincial caps to his name, along with two Super Rugby appearances for the Crusaders.
Canterbury coach Rob Penney said: "It is a shame to have lost a player so young who has still to reach his potential, but opportunities to play at a club like Munster do not occur very often. We wish him well."