No. You cannot send money without setting a UPI PIN for a particular bank account.
Related Question
What if I mistakenly invoke the BHIM UPI application that I do not wish to use f...
Is intent feature available for both android and iOS users?
I have an issue with my transaction via intent flow?
What if someone has already created a UPI ID using my name?
Are there any charges to use UPI on Freecharge?
What is UPI 2.0?
Do I need to create a new UPI ID to get the benefits of freecharge UPI 2.0?
What is UPI One-time Mandate?
How can I create a mandate?
Can I create a mandate with the same start date and end date?
Can I send money without setting a UPI PIN?
No. You cannot send money without setting a UPI PIN for a particular bank account.