It is possible. There is two types of working visa for foreign nurses: one is H-1C to wrok in the hospital, but there are only a few hospitals are qualified for sponsoring H-1C visa. Read these links for more information on H-1C visa:
http://webapps.dol.gov/elaws/elg/h1c.htm
http://faq.visapro.com/h1c-nurse-visa-faq13.asp
Another is H-1B visa:
Many organziations can sponsor H-1B visa for foreign nurses. See this link for some information:
http://www.nolo.com/legal-encyclopedia/when-nurses-can-qualify-h-1b-visa-the-us.html
