The contract for the four newbuildings is worth KRW870bn ($774m), SHI said in a brief announcement to the Korean stock exchange.
The new LNG carriers are scheduled to be delivered from the shipyard by 30 September 2022.
In late-January, SHI landed its first order of LNG carrier under a deal to build two units worth KRW419bn for Celsius Tankers.
SHI has set a new order target of $7.8bn for this year.
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