The 32-year-old Olympic silver medallist split with Ismail Salas who has gone into semi-retirement and moved to Qatar.
Joyce, who has won all five of his fights by knockout, has been over to California for a trial with Sanchez, who also trains Middleweight champion Gennady Golovkin.
He told Sky Sports: “Abel is the perfect trainer for my come-forward style.
"He has won 18 world titles as a trainer with most recently Murat Gassiev and of course GGG, who I am proud to train alongside.
"Just training alongside him is bringing me on every day as he pushes me to do better.
"I am excited for this new chapter in my life and I am confident with Abel in my corner.
The Commonwealth champ is managed by former heavyweight champ David Have and has moved to California full-time to fulfil his dream becoming a world champion.
He added: "I will become world champion in the near future. The Summit Gym is now my new home."
And Sanchez is excited about steering Joyce to the top of the heavyweight scene.
He said: “Looking forward to my first heavyweight champion Joe Joyce.
"He comes to me with great credentials.
"Now it's up to me to make him the elite professional heavyweight champion I know he can be."
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