Can i complete ethics module after the passing of P1 paper?

Hi, yes you can.

This module is available to any ACCA student once he/she is eligible to sit P1.
And it’s obligatory to complete it before u apply for membership.

That’s how it is described at FAQs for this module:
“Students registering or re-registering after 1 January 2007 – are required to complete the Professional Ethics module before they apply for membership. Students are given access to it as soon as they become eligible to take Paper P1, Professional Accountant.”