Found some info online...hope it helps
mom.gov.sg/workplace-safety-and-health/wsh-service-providers/find-approved-service-providers/find-a-wic-designated-insurer
etiqa.com.sg/business-insurance/
sompo.com.sg/commercial-insurance-products/work-injury-compensation
singaporewica.insure/
Or you can contact my broker namely Michael at 8188 8158. He can help you to compare the plans of multiple insurers.