Luckily, there are many places around the world that offer these chunks of land for sale, in the Caribbean, Greece, South America, Canada, the U.S., and beyond. Private islands come in all shapes and sizes and can cost anywhere from $200,000 to $200 million, depending on what you're looking for.

A real estate agent is licensed to help people buy and sell real estate and is paid a commission when a deal is completed. The agent may represent either the buyer or the seller. A real estate broker does the same job as an agent but is licensed to work independently and may employ agents.

Can you buy a private island? Yes. In most cases, you will need a deposit of 10 percent of the purchase price to enter into an agreement of sale. You will also need to arrange for a jumbo mortgage or private financing to cover the remainder of the purchase amount.

You can find private islands for sale via Private Islands Inc. or Vladi Private Islands, or by contacting a realtor who specializes in big-ticket sales. Additionally, some high-end real estate companies, like Sotheby's International Realty or Christie's International Real Estate, list private islands for sale.