Josh Davey took four wickets as the Scots prevented the Dutch reaching their target of 149.
Davey ended a 53-run opening partnership between Ben Cooper and Michael Rippon and Con de Lange's two for 17 also proved crucial.
Earlier, all-rounder Richie Berrington top-scored for Grant Bradburn's side with 38 runs as they reached 148-7.
The Scots beat opening Group B opponents Hong Kong on Saturday and the top two from the two four-team sections will progress to the semi-finals.
In Group A, Ireland recovered from an opening loss to Afghanistan by beating Namibia.
Scotland beat the Netherlands by seven runs to claim their second Desert T20 Challenge victory in Abu Dhabi.