In order to rent or lease a car from Sixt Singapore, you will need to comply with Singapore’s driving requirements. You will need to posses a:
Valid Singapore driving license
Foreigners who are staying in Singapore for less than 12 months will have to produce a valid foreign driving license and an International Driving Permit (IDP).
Foreigners who continue to stay in Singapore after 12 months will be required to obtain a valid Singapore Driving License before renting or leasing a car from Sixt Singapore. This can be done by applying for a driving license (if you don’t have one) or converting your existing foreign license to a Singapore driving license.