There was an old French IGN map "Les Chemins de Saint Jacques de Compostelle" (which I have and am not selling sorry), which showed all of the major Camino routes from as far away as Greece, Romania, and Poland, but very sadly they've replaced it in their catalogue with one showing only the routes in France.
Of course, for the current routes in Spain, that old map is very VERY out of date, and it would be mostly useless for such purposes as route planning on the VDLP ... and indeed for any purely Spanish Ways, a good and very recent map would obviously be best.
But one amazing thing about this old IGN map is that instead of showing the present somewhat politically or even slightly touristy -designed routes of the yellow arrows and etc, it shows the trace of the most traditional and historical paths -- so that for example the Camino de Madrid on this map is shown as following what has turned into the foul dual carriageway road between Valladolid and Léon, instead of the current far more hiker-friendly but completely unhistorical route up to Sahagun.
And whilst in most cases this sort of anachronostic detailing of old routes on that old map is pretty useless for the purposes of walking in Spain, it's very useful indeed on this side of the Pyrenees or for planning non-standard routes -- but this time 'round I found it to be very useful indeed for planning the route of my home-to-home one in the first half of 2019, via Andorra and Salamanca and Fatima.
Then again, I was amazed to find, this time round, that a certain extremely old map --
https://alainbrunel10.files.wordpress.com/2010/10/caminos-st-jacq1.jpg -- actually came in very useful, when I came upon it in wall-poster-size-form, to plan a certain detail of my route !!
Some contemporary maps are still helpful for off-the-beaten-track planning --
http://evasion-online.com/les-voyages/europe/les-chemins-de-compostelle --
http://www.e-voyageur.com/sites/default/files/imp/b/4/a/les-chemins-de-compostelle- -- even
http://www.compostelle-paca-corse.i...170113-carte_des_chemins_compostelle-rome.png
-- but really the most useful tool for the up-to-date contemporary routes that I've found to date is a Czech computer and mobile app called mapy.cz (exists for PC, Android, iPhone, even Windows Phone) ; it does bug out sometimes (rarely) for particular locations, but it shows the majority of all European long-distance hiking trails, which naturally include all of the major and minor waymarked Camino Ways.
