The job is the former left-back’s first as a permanent boss, having overseen Russian outfit Anzhi Makhachkala in both an assistant and a caretaker capacity in the last two years.
Carlos, who ended his playing career at Anzhi but lived in Turkey between 2007-2009 whilst featuring for Fenerbahce, has also turned out for Real Madrid, Inter Milan, Corinthians and Palmeiras, collecting three Champions League titles with Real.
He earned 125 caps for Brazil, winning two World Cups and scoring 11 times – including an infamous ‘banana’ free-kick against France at Le Tournoi in 1997.
The 40-year-old said, "I'm delighted to be here, I want to thank the fans for giving me a great reception. "We have a very good team and great technical staff who believe in what we want to achieve. "We need the stadium to be full every game, we want to play exciting football but need you here with us."
Carlos’ friend and Brazilian coach Cesar Domingos will serve as his number two with Sivasspor alumni Murat Erdogan working as sporting director.