This is not a problem. Just make the apk (installation file) available on an internal website and set the mime type to application/vnd.android.package-archive. Then people can install the application over the intranet directly from their devices.
Other alternates include:
- Installing from the PC using the
command line tool adb (comes with
the SDK).
- Installing from the PC using a 3rd party tool like this.
- Installing on the device (from SD card) with a free market place call AppManager by zx128.