A Reef Ball Breakwater could be the answere, after years of use the results are in.
Lee E. Harris, Ph.D., P.E. after research concluded ” The submerged breakwater project presented in this CETN demonstrates the technology available to provide shoreline stabilization due to wave attenuation at a site with a low tidal range and wave climate. In addition, the use of artificial reef units for the breakwater also provides habitat enhancement for the marine life, which can be enjoyed by divers and snorkelers. ”
Take a look at the Army Corps paper.
Reef Innovations can help you with a plans and products to restore beach sand and create a great breakwater.
McDill Breakwater 2010