It can be done with the help of liquid nitrogen, by freezing the oocysts/sporocysts and then crushing it in a mortar-pestle. ( For high yields alternate cycles of freeze-thawing will be helpful) Also you can use acid-washed glass beads to break the oocysts and then RNAse and Proteinase K treatment DNA can be extracted using chloroform:phenol extraction protocol.
You can either use the DNA extraction columns or Trizole Extraction method after homogenization of samples by adding glass beads and put in bead beater.