The steps, which include tax deductions for domestic travel and hotel renovations, are part of a series of stimulus measures aimed at lifting economic growth above 2.2% this year.
Southeast Asia's second-largest economy grew 2.5% last year, lagging peers.
Thailand's foreign tourist arrivals from Jan. 1 to Oct. 12 dropped 7.54% from the same period a year earlier, the Tourism Ministry said.
There were 25.1 million foreign visitors during the period, it said in a statement. Malaysia was the largest source market with 3.61 million visitors, followed by China with 3.58 million.