Any non BSN RN can sit for the CWCA exam (certified wound care associate), there is no education, it is simply a certification exam that confers specialty knowledge in wound care for $375--see www.abwm.com
The "WCC" (wound care certified) education is a week long (upwards of $3,000), with an exam at the end (I personally don't feel it should confer wound care specialty knowledge because they basically teach you to the test, but it's great--and expensive--education).
There are many, many CEU courses you can take to further your education, they do not confer you a "certification" but they're accredited and informative! Some great ones can be found at www.sawc.com--at
the naccme website link, also the global wound academy at the smith&nephew website, as well as WoundTalk