Yes, there are at least two routes. One is from central Poland (Warsaw?) west in the direction of Berlin, and should connect to the newly marked Via Regina at the border. From Berlin, south towards Konstanz and thence across Switzerland to Geneva, connecting to Le Puy. Alternatively from Berlin, more westerly through Cologne, connecting with the Vezelay route through France.
A second is from southwestern Poland (Posnan, perhaps further north/east), heading due south to Prague. From Prague there are two routes through Germany; the northern one leads through Nuremberg to Konstanz while the southern one leads through Regensberg and connects across the southern end of Lake Constance. These two routes rejoin at Einsiedeln in Switzerland. Thence to Geneva and onward to Le Puy. I have walked the northern route from Prague as far as Einsiedeln, and extensive details are in my blog.
There is possibly a third route from northern Poland (Gdansk), west across the Baltic plain and Pomerania to Hamberg, thence south through the Netherlands and Belgium, connecting with the Vezelay route.
The Catholic organizations in Poland would be your best source of information on pilgrimage routes there. There are extensive German-language guides available on the many pilgrimage routes in Germany, Austria, and Switzerland. Depending on your pace, six months could get you from Konstanz, Germany to Santiago, Spain. If you are an American, remember you only have 90 days in the Schengen visa area.
