[1] At the age of twelve, he entered trials and was selected for the youth academy of Buriram United.
[2] The team won the U-19 Thailand Championship ("Coke Cup") in 2017, where Nopphon was named Best Goalkeeper.
With Nakhon Pathom he was third in the table and thus qualified for the promotion games to the first division.
[6] However, he was heavily criticized for his performance in October's 2018 AFC U-19 Championship, where Thailand conceded an equalizing goal at the 87th minute and ultimately lost 3–7 to Qatar in the quarterfinals, missing their chance at the U-20 World Cup.
[7] In March 2019, He was called up to the U23 National Team for the 2020 AFC U-23 Championship qualification and 2019 Merlion Cup,[8][9] but was dropped for the 2019 SEA Games.