No, you cannot work in Singapore with a tourist visa. A tourist visa is intended for individuals who are visiting Singapore for tourism purposes, such as sightseeing, visiting friends or relatives, or attending conferences or events. It does not permit you to engage in any form of employment or work, whether paid or unpaid.

If you wish to work in Singapore, you will need to obtain an appropriate work visa or permit. The Singaporean government offers various work visas depending on your qualifications, skills, and the nature of the job you intend to undertake. Some of the commonly used work visas in Singapore are the Employment Pass (EP) for professionals, the S Pass for mid-level skilled workers, and the Work Permit for foreign workers in specific sectors.

To work in Singapore legally, you will typically need a job offer from a Singaporean employer who will sponsor your work visa application. The employer will need to satisfy certain criteria and demonstrate that there are no suitable Singaporean candidates available for the position before hiring a foreign worker.

It is important to abide by the immigration laws and regulations of the country you wish to work in. Working without the appropriate visa or permit can result in serious consequences, including deportation and a ban on future entry into the country.