The five-megawatt reactor will be built at the Jordan University for Sciences and Technology near the northern city of Irbid, commission chief Majad Hawwari said.
"The approval of the project came after two years of studies and examination," Hawwari said in a statement.
The Korean Atomic Energy Research Institute and Daewoo Engineering and Construction Co will construct the reactor, which is scheduled to become operational in 2016, he added.
"The reactor will help the commission build expertise and capabilities to prepare for constructing nuclear power plants in the future," Hawwari said.
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Amman is currently weighing rival bids to build the reactor by Russia's Atomstroyexport and a consortium led by French nuclear giant Areva and Japan's Mitsubishi.
With desert covering 92 per cent of its territory, the kingdom is one of the world's 10 driest countries and wants to use atomic energy to fire desalination plants to overcome its crippling water shortage.
Importing 98 per cent of its power needs, Jordan also wants to develop nuclear technology to meet its growing energy requirements.