Hi ! In the AudioPluginHost provided by JUCE, we can specify additional folders paths to scan VST or VST3 but, not for the Audio Unit plugins. Even in the AudioUnitFormat::searchPathsForPlugins method, the FileSearchPath argument is ignored.
Is there an explanation ?
You can only install AUs in /Library/Audio/Plug-ins/Components or ~/Library/Audio/Plug-ins/Components - JUCE’s plugin scanning code will scan both of these paths using some OS methods like AudioComponentFindNext (see here) so it doesn’t make sense to be able to add more search paths.
Thank you for your answer !
And it’s not possible to install the Audio Units on an other hard-drive ?
No, I believe they need to be installed on the system hard drive in either of the 2 locations that I mentioned above.
Thank you for the clarifications ! Solved subject 
