Why didn't king Philip go on to conquer Sparta?

Answer 1

Philip II during his campaign to be the leading state of Greece sent a message to Sparta saying "You are advised to submit without further delay, for if I bring my army into your land, I will destroy your farms, slay your people, and raze your city.." Sparta sent back a reply "If". Alexander and Philip stayed clear of Sparta. With much of Greece already united under his hegemony, Sparta could be left alone while he concentrated on his campaign against the Persians who had subjugated the Greek states in Asia Minor.

Answer 2

Alexander the great would have taken over ancient Sparta for the best fighters in the world. he would have also taken over Sparta to gain alliance with most of Greace

EDIT: Alexander the Great never took over Ancient Sparta or gained any kind of control over them, he never even faced them in battle. The closest he came to taking control was when he formed the "pan-hellenic" league, all the Greek states took part in this league, with the exception of Sparta who remained neutral, and refused to take part.

Answer 3

Sparta had lost so many of it's military age manpower that it had become a minor power, and it was not worth the effort when he already had control of Greece.