How do I import SoapUI project in Postman?

Those two tools do not have a common format they can export to. The only common format between them is Swagger, which either of them can import. However, neither of them is able to export into this format.

Further, Postman is made with REST services in mind. As such, it cannot do anything with a WSDL. If you definitely must use Postman to test SOAP services, you will have to map all your calls as a POST call, unfortunately, all manually.

Updates:

I did little more digging. It seems that SoapUI is able to import a Postman collection.

And further, SoapUI is able to export a Swagger description: Project > Export Swagger.

Personally I have not tried either of these options.

From the previous comment, you can export and import collections and projects between Postman and SoapUI but only REST projects.

Exporting to Swagger in SoapUI will result in an error for a SOAP projects.

"Importing SoapUI projects into Postman", referenced in the previous post, is referring to a REST Project not a SOAP project.