The 27-year-old is part of a 25-man squad currently preparing for next month's World Cup in New Zealand, and will join up with the Sharks after the tournament.
Leota has represented the Otago based Highlanders 24 times in Super Rugby and has been a member of the Manawatu side in the New Zealand Provincial Championship since 2004.
He missed part of the 2010 season through injury but has fought his way back to full fitness.
Sale executive director of sport Steve Diamond said: "Johnny is a great signing for us and I am sure he will fit in well at the club. He is playing well and I have had my eye on him for some time. He is a great defender and a great line breaker with ball in hand.
"Fans will remember when we signed Graham Bond nine years ago and what an impact he had. Johnny is a very similar player and we have high hopes for him."
Gilbert has released a new line of rugby cleats. The Gilbert Virtuo 8S is part of the exciting new product. Check it out.
The entire All Blacks apparel line has been updated for 2013/14. Check out the New Zealand All Blacks polo.
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The All Blacks Performance t-shirt is black with hints of blue from the training jersey. Very Cool.
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The NEW All Blacks 2013/14 jersey has arrived at World Rugby Shop. Dare to wear the colors of the All Blacks.
