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) issued by Automobile Association in Singapore.
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.