The firm has sold 110,000 Nanos, touted as the world's cheapest car, since then.
Tata Motors, India's largest truck and bus maker, is also introducing five new commercial vehicles in Sri Lanka, it said.
Tata Motors launches Nano in Sri Lanka
The firm earlier this week reported full-year profit more than trebled, driven by higher sales at home and at its Jaguar and Land Rover unit.
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