There are a number of organizations and educational institutions that offer workshops and programs that prepare missionaries for the field. Here are some that desire to serve nurses or have programming designed for missionary nurses.
Cedarville University is offering a Master's Degree in Global Health Ministries (GHM)
The global health ministries area of focus prepares nurses with expertise in providing population-based care, domestically and around the world. This area of focus is a natural fit with the mission of Cedarville University and the department of nursing. The nurse has advanced knowledge and skills based on world health problems and issues, environmental health, community development, societal structure, and policy development. An emphasis is placed on using nursing as ministry through congregational health care and addressing global heath issues through professional ministries. Graduates completing the Global Health Ministries track will be eligible to sit for the Advanced Public Health Nurse - Board Certified ANCC certification exam. For information go to: http://www.cedarville.edu/Academics/Graduate/MSN/GHM.aspx
The Center for World Missions has a course called Perspectives
It is a dynamic 15-week course in which students discover what God is doing around the world and consider their part in His purposes. Since 1974, more than 80,000 believers in North America have taken the Perspectives course. In 15 lessons, students engage with a range of dynamic speakers. Weekly readings and study will help them dig even deeper. Join thousands of others in one of 200 locations. For more information go to http://www.uscwm.org/index.php/courses/detail_page/perspectives/.
The Journey Deepens Retreat
These weekends help prospective missionaries explore what it is like to be a missionary, discover whether a missionary or sender role is God's fit, and connect with mission agencies. This is for high school seniors, college students, young adults, mid-lifers, baby boomers - anyone willing to explore becoming a missionary.
For more information go to http://www.thejourneydeepens.com/retreats.asp

Health professionals in intercultural health ministries need
training in the missiology of healthcare:
The Global Health Training Program at King College offers workshops in health missiology for health professionals serving the poor domestically and internationally. For more information please go to http://www.peeke.king.edu/index.php?id=476 or write to globalhealth@king.edu.

Medical Strategic Network, http://www.gomets.org/index.html.
The Medical Strategic Network is a nondenominational evangelical
organization dedicated to equipping health professionals
to reach their spheres of influence for Christ. In many cases
Christian health professionals feel ill-equipped to relate
the gospel to the questions and concerns of their non-believing
colleagues and patients. Designed by professionals for health
professionals, METS conferences and preceptorships provide
practical, hands on training to more effectively treat patients
- both spiritually and physically.