All Blacks star Nonu was a tormentor for the Springboks for many years from centre having 102 test appearances between 2003 and 2015, and most recently played in France for Toulon.
He will begin a new chapter with a short-term contract in Durban, which according to Rapport will see him help develop the likes of Jurenzo Julius, Jaco Williams and Zekhethelo Siyaya.
Nonu played with current Sharks coach JP Pietersen at Toulon.
“The best players don’t just leave memories, they leave standards. That’s what Ma’a brings,” Pietersen said in a statement. “Every conversation, every training session and every interaction is an opportunity for our players to learn what excellence looks like.”
Nonu is looking forward to the unusual challenge, that will see him be available to play in his inside centre role if needed by the Sharks.
“The Sharks are one of the world’s most iconic rugby clubs and Durban has always been a special place for me to travel to," Nonu said.
"One of my earliest away matches in Super Rugby was played here, and I’ve carried fond memories of this city and its passionate rugby fans ever since.
“I have immense respect for JP. We competed against each other for many years, and I’m looking forward to working with him and the team.
“This is a great opportunity to give back to the game. Working alongside the future stars of our sport is exciting, and I’m looking forward to doing everything I can to help the club during my time there.”