[3] On 11 July 2013, BEC Tero Sasana sacked René Desaeyere and promoted Choketawee Promrut to be the club interim manager.

[4] On 9 August 2015, Rangsan was promoted to be the interim manager of BEC Tero Sasana after the removal of Kenny Shiels.

The club set to relegate to Division 1 according to the final standing but still remained in top league after the withdraw of Saraburi from the competition.

On 23 April 2018, FOX Sports Asia reported in an article that Rangsan was appointed head coach of Police Tero following the departure of Englishman Scott Cooper.

[7] After 5 years at Police Tero, Rangsan was appointed to replace Surapong Kongthep as the manager of Thai League 1 club Port on 8 November 2023.