If you're particularly interested in Germany, visit this site for an overview of where schools are and links to their websites;
http://www.agis-schools.orgThis is the Association of German International Schools.
At the moment you may find that there are no jobs vacant; this is because there is a big round of recruiting in January-February each year, in which many posts get filled. However after this time posts continue to become available as staff make last minute decisions to move on, also many of these schools are continually expanding and the need for staff can arise at any time of the year. Some schools look at on spec applications; it's always worthwhile sending your CV to schools to register your interest in as you never know what might come up and you might just be the person to fill a need.
Because of the particular demands of working in an international school you will find that most schools are looking for well-qualified and experienced teachers. You need to be confident and adaptable to cope with children from a variety of educational and cultural backgrounds, many of whom arrive in your classroom, often in the middle of a term, with little or no English which is the usual language of instruction. Likewise parents are often concerned and demanding for their offspring; they are often paying dearly for the privilege of a private education and don't always understand the educational approach of the school which may be very different from their own experience. You too have to adapt to different curricula; some schools for example teach the British curriculum, others the curriculum of the International Baccalaureat Organisation. Most reputable schools will therefore be looking for people with a degree and professional teaching qualification, many look for a masters degree, and at least two years teaching experience which ideally would include experience of teaching second language learners.
I too teach in an international school and it's great. Good luck!