“If you look at our batting, everyone got set but couldn't score big. It's a thing to think about,” he said.
“If you get set, you have to score. We have to play more first-class cricket.”
Sri Lanka won the first test in Sylhet by 328 runs.
They also won the three-match T20 series 2-1 but lost the ODI series by the same margin.
Bangladesh will host Zimbabwe for five T20 matches in May in their next international fixture, ahead of the T20 World Cup starting in June.