Thomas, who comes from another Tata Group firm, has over 23 years of experience in the plantation industry, Tata Coffee said in a statement here today.
His appointment was cleared at a Tata Coffee Board meeting held on August 3, it added.
He was earlier Managing Director of KDHP (Kanan Devan Hills Plantations), an associate company of Tata Global Beverages Ltd.
Thomas was the Managing Director of KDHP since 2012.
Tata Coffee, a subsidiary of Tata Global Beverages, is Asia's largest coffee plantation company and India's third largest exporter of the beverage.
Tata Coffee had reported 16 per cent fall in consolidated net profit for the quarter ended June 30, at Rs 25.4 crore, citing higher expenses.
The company, however, saw a rise in total consolidated income in the April-June period of FY16 at Rs 396.04 crore, up from Rs 374.52 crore in the same period of last fiscal.