"Today's breakfast with the club president was like a warm farewell from a wonderful boss to me. I enjoyed my time working here and am very grateful for the opportunities given even for a short time," Kiatisuk wrote on his social media account on Tuesday.
The 50-year-old coach said the reason for leaving was family matters and he would return to Thailand. He also hopes to maintain a positive relationship with the club, players, colleagues, fans and media in Vietnam.
"I wish the club success," Senamuang wrote.
While seeking Senamuang’s replacements, CAHN will appoint technical director Tran Tien Dai as interim coach.
In Senamuang’s last match in charge, CAHN beat Khanh Hoa 3-1 in the V. League on Sunday. A day later, the coach posted photos with players and coaching staff on social media, with the caption "These moments would not have existed without your support."
Senamuang started this season as head coach of another V. League club, HAGL. They had a poor start to the season, taking them eight games to get their first victory. After that, Senamuang became head coach at CAHN.
The team experienced a great start with three wins in a row and a draw, before losing 3-0 to Viettel.
After mixed results in the following fixtures, CAHN was left in a difficult position and Senamuang was also said to have lost control of the dressing room.
Kiatisuk won V. League titles with HAGL in 2003 and 2004 as a player.
In 2020, he returned to HAGL as the club's head coach. He was also the head coach of the Thailand national team in 2014-2017.