The 22-year old Brazilian will be with the club for the remainder of the 2020 season and is his fifth loan spell since beginning his professional career with Sao Paulo in 2007.
Dallas technical director Barry Gorman said the capture of Goncalves was a major coup for the club.
"Having played for São Paulo's first team, Jackson brings youthful experience to FC Dallas," Gorman said. "Adding a player to our roster who has had senior-level experience in a Brazilian first division is an enormous opportunity for us. He is a wonderful individual, a good human being and he fits the mold of the type of player we want wearing the FC Dallas colors."