Wasps boss Lee Blackett said: "We're looking for a world-class tight-headed head and in Vincent, we've found our man."
"We are thrilled to be able to bring on an experienced international player like him. He will really add to our scrum."
Koch believes "it is time for a change" after five years in north London.
"The last few years Saracens has been amazing," he said. "I've had a great time there, that I'll always cherish.
"The saying goes 'a change is as good as a vacation' and Wasps has a new challenge that I need for the next chapter of my career. I believe Wasps will go in an exciting direction under Lee Blackett." are."
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