In early 1996, he won the WBU flyweight title came in a twelve-round win over Angel Almena in Chiang Rai.
In the first defense he traveled to Italy to face the Luigi Castiglione at Town Square, San Mango d'Aquino, on 8 August 1996.
On September 3, 1999 he challenged for the WBA flyweight title against reigning champion Leo Gámez in Mukdahan.
[1] He lost the title in his second defense against Eric Morel at the Alliant Energy Center, Madison, Wisconsin on 5 August 2000.
[1] Sornpichai retired after losing ninth-round knockout to a Japanese Jun Toriumi in early 2004 at Korakuen Hall, Tokyo, Japan.