The 44-year-old made it two play-off wins from as many attempts to claim his sixth tournament triumph on the European Tour.
Jaidee produced his best round of the weekend, a seven-under 65, to move up six places to tie for first alongside Victor Dubuisson and Stephen Gallacher.
Having produced an impressive final round, Jaidee faced a nervy wait as Dubuisson needed a birdie at the last to win it outright, only for the Frenchman to three-putt from just off the 18th green.
A stunning putt from Gallacher saw him sneak into the play-off, but joint overnight leader Henrik Stenson was unable to secure the eagle required for his national title.
Stenson had shared the lead with Eddie Pepperell but the Englishman could only make par on the last day to slip to tied sixth.
When it came to the crunch, Jaidee kept his cool to sink a birdie on the 18th, the first play-off hole, while Dubuisson and Gallacher could only manage par.
Following his well-timed surge to the top of the leaderboard and subsequent showing in the extra hole, Jaidee put his achievement down to hard work.
“I worked hard today. I started with three birdies in a row, had another one on six, then a good comeback on 11,” he told the European Tour website.
“We were nervous the last few holes – 16, 17 and 18 are tough holes ” but 16 under was good enough for a play-off.
“The golf course is wide open, you have to hit good golf shots and the weather helped a little bit.”
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