Cross-laminated　timber　(CLT),　recognised　for　its　environmental　benefits,　faces　challenges　in　its　excessive　humaninduced　vibration　due　to　its　lightweight　nature.　This　research　investigates　the　application　of　a　tuned　mass　damper　(TMD)　for　vibration　control　in　CLT　floor　slabs,　focusing　on　enhancing　the　structural　performance　of　using　this　sustainable　building　material.　The　study　introduces　a　solution　by　integrating　Shape　memory　alloy　(SMA)　into　TMD　systems　(SMA-TMD),　utilising　the　properties　of　SMAs　for　effective　self-centring　and　consistent　damping,　and　it　aims　to　incorporate　pre-strained　SMAs　into　TMDs　to　improve　the　damping　performance　of　the　system.　Experimental　testing　and　finite　element　simulations　confirm　that　pre-straining　SMA　bars　not　only　contribute　to　the　self-centring　but　also　considerably　increase　the　equivalent　viscous　damping　ratio　of　the　SMA-TMD.　Findings　from　the　simulations　demonstrate　that　the　optimised　SMA-TMD　system　can　substantially　reduce　CLT　floor　vibration　and　accelerates　the　energy　dissipation　effect　under　human　footfall　loadings,　overcoming　one　of　the　primary　limitations　of　CLT　in　construction　applications.　This　advancement　supports　the　broader　adoption　of　CLT　as　a　sustainable　building　material　by　providing　a　viable　solution　for　vibration　control.