Not to sound overly pedantic but it depends on what you mean by 'Greek Magic'.
If you're referring to a modern practice in which the magician invokes or asks for the blessing of a Greek deity "O Aphrodite, help me get this cute guy/girl in college and I'll buy you a bunch of roses, thanks", then yes, it does exist and is frequently practiced. Whether or not the deity in question responds is entirely up to them.
On the other hand if you mean a practice of Greek magic that is authentically ancient Greek in its method, then also yes. However you'll be hard pressed to find an easy 'how-to' manual as most texts about Greek magic are academic studies.
You could look at The Greek Magical Papyri in Translation by Hans Dieter Betz, or Curse Tablets and Binding Spells from the Ancient World by John G. Gager. The Papyri and Tablets aren't purely Greek however and have Roman, Egyptian and Middle and Near Eastern influences as well. They are however collections of non-modern spells and curses, though many are somewhat impractical to perform.