VMware OVF Tool 명령어를 이용해서 하면 됩니다. 변환은 한참 걸리는 편입니다.
[tool 위치]
cd /Applications/VMware\ Fusion.app/Contents/Library/VMware\ OVF\ Tool/
[명령어 사용 예]
./ovftool --acceptAllEulas /Users/it/Documents/Virtual\ Machines.localized/Windows\ 10\ x64.vmwarevm/Windows\ 10\ x64.vmx /Users/itk/Desktop/Win10x64.ova
Opening VMX source: /Users/it/Documents/Virtual Machines.localized/Windows 10 x64.vmwarevm/Windows 10 x64.vmx
Opening OVA target: /Users/it/Desktop/Win10x64.ova
Writing OVA package: /Users/it/Desktop/Win10x64.ova
Disk progress: 3%
출처/참고 : http://techiezone.rottigni.net/2014/07/howto-export-a-vm-in-ova-format-in-vmware-fusion-for-os-x/