Connacht are currently two points clear of Leinster at the top of the GUINNESS PRO12 table.
And Boshoff believes, after holding discussions with head coach Pat Lam, that Connacht's achievements this season are just the beginning.
"I'm really excited about the move to Connacht Rugby and Galway," Boshoff said.
"From speaking to Pat, I have a good understanding of what the club is about and it's clear that there is a huge amount of passion and ambition there in terms of where they want to go.
"I've watched a lot of the Connacht games this season. The rugby they are playing is really exciting and I believe that I can fit in to the structure and add something as well. I can't wait to get stuck in.
"It's a big move for myself and my wife Monique but we're really looking forward to meeting everyone and settling into life in Ireland."
And Lam believes the signing shows Connacht are a force to be reckoned with.
"In the context of where we are and where we are planning to be, Marnitz is an important signing for our squad," said the head coach.
"A lot of time and research went into identifying the right, experienced out-half to fit the profile we were after.
"Marnitz is not only a proven and reliable goal kicker with an outstanding kicking game, but his game management has seen the rise of the Lions in Super Rugby over the last three seasons as well as him leading the Golden Lions to Currie Cup success.
"His experience will be invaluable to our young backline and we're looking forward to welcoming him and his wife Monique to the West of Ireland."
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