The Indiana High School Athletic Association Board of Directors has approved the new rule.
Non-school sponsored athletic facilities are conducting clinics for students and trying to influence them to attend a school where they are coaching.
A state senator says she may seek a referendum on single-class basketball, despite overwhelming disapproval from players and administrators.
Not since 1997, when Bloomington North won the boys title, has the state held a single basketball tournament for all high schools in the state.
Tonight's final meeting takes place at Jimtown High School in Elkhart.
The move comes on the heels of legislative action to force Indiana to return to a single tournament including all schools.
IHSAA members say the students need academic accountability to be able to play.