Elton Brand is now a free agent ... professionally and personally -- the NBA superstar's wife has filed for separation.
Brand's now estranged wife Shahara Simmons filed the docs a couple weeks ago ... shortly after their 9th anniversary. They met during college at Duke University and have 2 children.
In Sahara's docs she says they hashed out separation of assets back in April, and all that's left to hammer out is child custody and child support.
Brand played in Atlanta for the last 2 seasons, but is now looking to rebound with a new team. Kinda like Shahara, we're guessing.