Decker was the first Brazilian president of footwear brand Asics Brazil and has had various roles in the Brazilian sporting goods industry.
The UFC's Brazilian headquarters is in Sao Paulo and Decker is tasked with the organisation of the MMA promotion's events in the country, as well as driving growth in its business there.
After being appointed by Garry Cook, the UFC's chief global brand officer, Decker said he was honoured by his appointment.
"I am honoured to be joining the UFC. Mixed martial arts has long captivated the Brazilian sport fan and held an important place in the Brazilian sporting landscape and I am excited at the opportunity of joining the world's leading MMA organisation," said Decker.
"I have spent my career leading brands to new heights and will bring the same intensity and experience to the UFC," he added.