Simply set up facing a wall with one ball. The player will bounce the ball before passing it towards the wall.
On return of the ball, the player will bounce it with the other hand before passing with that hand, with the ball returning back to the previous hand, and this is repeated.
Rebounding is the least glamorous thing in basketball and one of the most decisive. It is also almost entirely a habit, which means it is entirely coachable.
Good spacing is only the start. The best modern offences teach players to attack the defence's rotations and play in a permanent 4-on-3 - here is how to coach that read.
The ball screen produces almost half of all professional offensive possessions, yet most teams still teach it as a memorised play. The modern approach trains the read - giving players a framework to decide based on what the defence does, not what the coach called.