Dufry said in August that it signed a master concessionaire agreement to run all airside duty free space in Mattala.
It expected to have 1,000 square feet of space divided between arrival and departure sections.
It will have liquor, tobacco, perfumes, cosmetics and confectionaries at both levels. The firm said it will work with other Sri Lankan partners to provide electronics, local souvenirs and convenience items to travellers.
The duty free concession has been given to Dufry, a Swiss-based company which is working with Sri Lanka's Perpetual Holdings.
"The company is building the shops," Prasanna Wickramasuriya, head of Airport and Aviation Services of Sri Lanka said.
"I expect the shops could be opened in about two weeks."
The lack of duty free facilities in Mattala has been cited as a key drawback in persuading Sri Lanka's expatriate worker population to use the second international airport.
Expat worker accumulate duty free credits the longer they stay out and cannot