Can I sublet my rented apartment as a holiday home in Dubai?

Only with your landlord's prior written consent. Under Dubai tenancy law (Article 24, Law 26/2007), subletting without written landlord approval is illegal. Even with consent you still need a DET holiday home permit and the building NOC. Listing a rented flat short-term without both the landlord's permission and the permit breaches Dubai's tourism and tenancy rules.