Munchangiput's Dhooliputtu area where the incident took place borders Odisha.
Superintendent of Police Dr Koya Praveen said the injured jawan was being treated at a hospital here and was out of danger.
Road-opening parties of Central Reserve Police Force (CRPF) were carrying out a combing operation when the Maoists triggered the blast in a deserted patch, about one km from the Dhooliputtu junction.
There was also a brief exchange of fire between CRPF jawans and the rebels after the blast.