is adamant ... she's NOT currently being treated in a rehab facility -- but tells TMZ she currently WORKS at one.
We spoke to the former "Full House" star ... who tells us reports that she's in treatment for substance abuse are "such bulls**t ... I am absolutely NOT in rehab."
Jodie -- who once battled with a meth addiction -- says she currently works as a clinical logistics coordinator at an L.A. rehab center, and her employer has allowed her to live in a studio apartment on the property while she deals with her divorce from husband #3 Morty Coyle
"I work for the center and they have been really generous in helping me with a place to stay as Morty wanted me out by the end of the month," Sweetin says.
"The owners of the facility said I could stay here as I got things figured out."
Jodie also says she's decided not to pursue full custody of the couple's 2-year-old daughter Beatrix -- and wants joint custody instead -- because she wants the kid "to have both of her parents in her life."
Jodie and Morty were married in 2012.