After retiring, in 2012, Alston joined the staff of the
Houston Rockets and served as their Player Development Coach for two seasons 2012–2015. On October 27, 2015, he was hired by the
Westchester Knicks to be an assistant coach. In August 2014, Alston traveled to the Philippines as a
SportsUnited Sports Envoy for the
U.S. Department of State. In this function, he worked with
Alison Feaster and
Erik Spoelstra to conduct basketball clinics and events for more than 375 youth from underserved areas. In so doing, Alston helped contribute to SportsUnited's mission to advance the status of women and girls around the world and to show support to an important regional partner. In August 2019, he was named head coach of the
Westchester Knicks of the
NBA G League. He held the head coaching position until the end of the 2021–22 season. On October 25, 2022, Alston was named an assistant coach of the NBA G League's
College Park Skyhawks. In November 2023, Alston was named head coach of the
Pioneros de Los Mochis of the
Circuito de Baloncesto de la Costa del Pacífico (CIBACOPA) ahead of the
2024 season. On November 1, 2024, Alston became an assistant coach for the
Wisconsin Herd. ==Personal life==