Reddit reviews The Modern Soccer Coach 2014: A Four Dimensional Approach
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Not exactly what you are looking for in terms of formal training/courses but I liked "The Complete Guide to Coaching Soccer Systems and Tactics" by Jacob Daniel http://www.amazon.co.uk/Complete-Coaching-Soccer-Systems-Tactics/dp/1591640687/ for less than £5 can't go wrong there.
Also "The Modern Soccer Coach 2014: A Four Dimensional Approach" by
Gary Curneen is fine, £6 http://www.amazon.co.uk/Modern-Soccer-Coach-2014-Dimensional-ebook/dp/B00GCEBBOM/
More formal: NSCAA Advanced National Diploma 2009 http://www.broomfieldsoccerclub.org/filebrowser/download/15397 (PDF)
Also freely available: U.S. Soccer Curriculum http://www.ossca.org/documents/ossca/coachingeducation/US_Soccer_Guide_to_Coaching.pdf