The Knicks have rounded out their coaching staff for next season with former Westchester coach Mike Miller.

Miller — not to be confused with the sharpshooting former NBA champ with the Heat — won G League Coach of the Year in 2017-18. Now he gets a promotion to the NBA, filling the last vacancy on David Fizdale’s bench. Miller neatly fits the player-development ethos the Knicks are trying to instill.

“Mike is an accomplished and respected coach who has been an integral member of the Knicks family the last four years with Westchester,” Fizdale said in a statement. “Mike is a great addition to the staff, a relentless worker who shares our approach to the game with an expertise in player development.”

Derrick Alston, Miller’s former assistant, will get bumped up to G League head coach.

Miller, 55, is an extended part of the Spurs coaching tree. Though he never worked under Gregg Popovich, he was an assistant with the Austin Toros, the Spurs’ G League squad.

Miller inherited a Westchester team in 2015 that was coming off a horrible 10-40 season. He went 108-92 in four seasons, including a 61-39 mark the past two seasons with consecutive trips to the conference finals and a G League-high nine NBA call-ups, though that was due in part to the Knicks’ sorry roster.

Miller’s promotion fills an opening created when assistant Howard Eisley left to take a spot on Juwan Howard’s new Michigan Wolverines staff. He rounds out a group that includes Jud Buechler, Kaleb Canales, Royal Ivey, Keith Smart and Pat Sullivan.