Transfer an App Store app to another machine without internet access
Short of cracking the code signing, you will need to have the receiving Mac connect to Apple's servers (through the internet) at least once to validate your account on that Mac. Once that is done, you should be able to run apps for the length of time that the code signing certificate remains valid.

You could also see about contacting the developer and see if you can purchase the app from them directly if you don't want to have the App Store model for software installation and validation.