If you want to share them put them in enterprise application project.

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An enterprise application may contain JAR files that the contained modules will use. This allows sharing of code at the application level, and is the best place to put utility JAR files, or your classes  that are used by multiple Web or EJB modules.

WebSphere uses several classloaders to load the application code from the modules deployed to the server. The number and function of these classloaders depends on the classloader isolation mode (otherwise known as module visibility mode) that has been specified in the WebSphere server configuration. There are four settings you can choose:

• Server -- uses the same classloader for the entire server.
• Application -- uses a separate classloader for each Enterprise application.
• Module -- uses a separate classloader for each module.

So I think you need to use classloader isolation mode = Module