There are 2 possibilities.
From Split airport by Taxi or bus to the Split ferry port.
1st– The easiest way is to go with Catamaran from Split. It leaves at 16:30 from Split and you are directly in Bol at 17:40. You can buy tickets online on www.jadrolinija.hr (we recommend you to buy ticket minimum 7 days before in full season)
2nd– Other solution is to go to the ferry in Split, the ferry will take you to Supetar (45min), Supetar is on the other side of the island, then by taxi or bus to the Bol (1 hour). The ferry schedule you can find on www.jadrolinija.hr
The taxi from Supetar to Bol is 350 Kuna (approximately 45 eur) if we organize the transport, you have to tell us the ferry time minimum one day in advance.