Is it possible to prevent the modification of a customized module by another administrator?
If so, how can I implement such a restriction?
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You would need to build a custom plugin to do that. The way to approach this is to leverage on the Joomla check-in/check-out feature to check-in your modules when you edit them and permanently keep them checked-in (!) That way, any other admin who comes around to change the content of the module won't be allowed to.
In your plugin config, you can add a field to select which module you want to permanently disable others from editing, but if your fellow admins discover the plugin they would probably change the settings too... unless you do something drastic to keep them out of the plugin too.