Your residential status decided whether or not you need to file an IT return in India. Residential status, in turn, is determined by the number of days you've spent in India in that financial year.
If you are an NRI then the income earned and received outside India, and money remitted back is not taxable for you. But if your income in India (by way of interest from savings account/fixed deposits or rental income) exceeds Rs. 2,50,000, then you must file a tax return in India.
Check your residential status here.