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Background: Modified back saver sit-and-reach test (MBSSRT) has more advantages over Back saver sit-and-reach test (BSSRT) in measuring hamstring flexibility among middle school children and adolescents. However, whether MBSSRT can be used instead of the other among the primary school going children is not yet clear. Objective : To estimate the association between BSSRT and MBSSRT for measuring hamstring flexibility. Procedure : One hundred and forty-one healthy children (5-12 years) were selected from the primary school identified by the cluster sampling method for this cross-sectional study. The subjects were asked to perform three trials of BSSRT and MBSSRT (both leg) in randomized order. Average was used for data analysis. The association between the two tests was established by Spearman Rank Correlation test. Results: The correlation between BSSRT and MBSSRT for right lower limb ranged from 0.43 to 0.77 with mean correlation of ρ = 0.66 (P < 0.01) and for left lower limb ranged from 0.46 to 0.78 with mean correlation of ρ = 0.68 (P < 0.01). Conclusion: MBSSRT can be used alternatively instead of BSSRT to measure hamstring flexibility among the primary school children.