Tomljanovic let her first WTA title slip out of her hands after blowing a 5-2 lead in the final set, sitting just two points away from victory.
The Ukrainian player broke for a 2-0 lead in the decisive set but then dropped the next five games to go won 2-5.
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She had an operation after the Australian Open on her eyes so I wanted to win it for my mum". The teenager won the opener 6-2, but then she lost the second set with the same scoreline.
Then in the tie-break, Yastremska took full charge with some deep groundstrokes, eventually blasting a forehand victor on her first match point to wrap up the victory.
With Tomljanovic needing only to serve for the match, Yastremska requested for a medical timeout complaining about a problem with her left leg.
Tomljanovic looked to be fuming after the final point, sharing a very frosty handshake with her opponent.
"I'm really happy that I made it to Thailand and played this week", said the Aussie.
It was Yastremska's second career title while Tomljanovic has now fallen to 0-4 in WTA singles finals, losing three in the past year after defeats in Morocco and South Korea.