  The Roman Space Telescope's Galactic Bulge Time Domain Survey will constitute
the most sensitive microlensing survey of the Galactic Bulge to date, opening
up new opportunities to search for dark matter (DM). Many extensions of the
Standard Model predict the formation of extended DM substructures, such as DM
subhalos, boson/axion stars, and halo-dressed primordial black holes. We
demonstrate that for such targets, Roman will be sensitive to a broad parameter
space up to four orders of magnitude below existing constraints. Our analysis
can be readily applied to other extended DM configurations as well.
