Please see Travel Advisories from the Singapore’s Ministry of Health (MOH) on COVID-19 :
Additional Precautionary Measures to prevent further importation and spread of COVID-19 cases :
From 16 March 2020, 2359 hours, all travellers (including Singapore Residents, Long Term Pass holders, and short-term visitors) entering Singapore with recent travel history to ASEAN countries , Japan, Switzerland, or the United Kingdom within the last 14 days will be issued with a 14-day Stay-Home Notice (SHN).
From 20 March 2020, 2359 hours, all Singaporeans, Permanent Residents, Long Term Pass holders and short term visitors entering Singapore will be issued a 14-day Stay-Home Notice (SHN). They will have to provide proof of the place where they will serve the 14-day SHN, for example a hotel booking covering the entire period, or a place of residence they or their family members own.
From 27 March 2020, All travellers must now submit the electronic health declaration before they enter Singapore using the SG Arrival e-Service. You can do so up to three (3) days before your arrival in Singapore.
Click here for more info: http://www.brf.com.sg/wp-content/uploads/2020/03/SGAC_health-declaration-v8.pdf