There is no such restriction for the foreigner clients for the importof foreign currency to India. A declaration certificate may be obtained from the customs upon arrival at the airport which helps you for the exchange of your currency to local currency and also facilitate you to export your unspent currency back with you while leaving the country. However, it is required to declare the currency upon arrival incase you are carrying Cash/Cheques/Drafts/Travellers Cheque equivalent to or morethan 5,000 (Five thousand) US Dollars. Changing of money should be done only with authorized banks and money changers and a currency exchange certificate must be obtained from the bank/money changer for equivalent amount by your name. Exchanging money from unauthorized sources with out money exchange certificate is an offence in India.