He started working as an assistant coach at KK Pärnu in 2015, but was promoted the head coach in 2016. Under his guidance, the club has won a bronze medal at the Estonian league in 2019 and a silver medal in 2021. In 2022, he became the Estonian Champion. In summer 2022, Rannula became the head coach for Estonian most ambitious team
BC Kalev. Rannula led Legia Warsaw to the Polish championship after a 56-year hiatus. He has worked as an assistant coach for the Estonian U18 and U20 youth teams. Since 2019, he is the assistant coach of the Estonian men's national team. ==Coaching record==