Yes. ICA lists Pakistan among the travel documents whose holders need a Singapore entry visa before travel. There is no visa on arrival for this route. An approved e-Visa lets you travel to Singapore and seek entry, but ICA still makes the admission decision at the checkpoint.
Use the passport you will actually present at the border for this check. Residence in another country, a foreign residence permit or a previous Singapore trip does not by itself turn a Pakistani travel document into a visa-free one.
If you live in Pakistan, MFA's Pakistan mission listing names a non-resident High Commissioner in Islamabad and gives a channel for visa enquiries, but it does not list an appointed visa agent. Ask MFA which route currently accepts applications from Pakistan before paying someone who claims to be appointed. If you live elsewhere, check the Singapore mission serving your residence.
Singapore visa for Pakistani travellers: requirements, fee and timing (2026)