Here are some helpful links:

• Sand Sculptors International, a site about the standards set for sand sculpting
• Sanqube.com, a site devoted to professional sand sculpting filled with profiles and pictures
• The Travel Channel, Best North American Sandcastle Contests, provides a list of sandcastle competitions all the way from British Columbia to South Carolina
• Beaches Family Resorts, Virtual Sandcastle, a site where you can build a sandcastle online