Josh Duggar -- I'm Backin' Out of Sandusky

Josh Duggar has pulled the plug on a conference he was scheduled to attend in the most ironic of places ... Sandusky, Ohio.

Josh was supposed to speak at a home schooling convention next week, but in the wake of his public sexual molestation admission, we've learned he's cancelled the appearance.

We're told Josh told the organizers he would be too much of a distraction and didn't want the focus of the conference blurred.