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Try reading this!
https://transferwise.com/au/blog/income-tax-in-thailand

In what instances do Thai residents working abroad need to pay income tax?
Whether or not you have a tax bill in Thailand will depend on whether you're classed as a resident or not. If you're in Thailand for over 180 days then you'll have to pay tax on any income earned in or remitted to Thailand that year. If you're in Thailand for less time, you might only have to pay tax in Thailand, on your earnings that originate in Thailand.

What are the income tax rates in Thailand in 2017-2018?
Thailand has a progressive tax system. The first 150,000 baht you earn is tax free, and then a progressively higher tax rate is applied based on how much you earn above that level.

If you’re employed, your employer will withhold tax from your wages under the pay as you earn (PAYE) system.

The most up to date rates available for both resident and non-resident taxpayers in Thailand are as follows:

Income range    Thailand income tax rate (%) 2017
*** Up to THB150,000    0%
THB150,001 - THB300,000    5%
THB300,001 - THB500,000    10%
THB500,001 - THB750,000    15%
THB750,001 - THB1,000,000    20%
THB1,000,001 - THB2,000,000    25%
THB2,000,001 - THB5,000,000    30%
Over THB5,000,000    35%
( Source 20 December 2017)

See if you can figure a way out of the tax implications.