The 29-year-old centre has made 58 appearances for Cardiff to date, scoring 14 tries. He has signed a two-year deal with Munster.
Commenting on the news, Munster head coach Tony McGahan said: "We are is obviously delighted that we've managed to secure the services of a player of his undoubted calibre for the next two seasons.
"I believe it shows the ambition that Munster Rugby harbours for the years ahead and I think it speaks volumes that a high quality player such as Casey chooses to come to Munster ahead of a very impressive chasing pack.
Speaking after training with the Blues today in Cardiff, Laulala commented: "I've enjoyed myself very, very much here at the Blues and was fortunate enough to win the Amlin Challenge Cup with them in my first season here.
"My family and me have thoroughly enjoyed our time in Cardiff and I'd like to thank everyone from the bottom of my heart for welcoming me.
"I guess this is a fresh challenge for me, it's something new and hopefully the Munster welcome will be as warm as the one I experienced here in Cardiff.
"Munster are a very successful team so I'm looking forward to joining them and experiencing life in Ireland. However, there is still a lot of rugby to be played this season so I am still fully focused on doing well for the Blues."