The current study investigated the effect of balance training on older adults’ balance control and multisensory integration using the sound-induced flash illusion (SIFI). Several studies have suggested that ageing affects the integration of information across the senses. In particular, recent studies have found that older adults are more susceptible to SIFI, suggesting that perception in older adults depends on the integration of sensory inputs across a broader temporal window than that in younger adults and may be linked to reduced balance control. Seventy-six older adults, including fall-prone older adults, were allocated to either a balance training intervention programme over a series of 5 weeks or a passive control condition. Multisensory processing was assessed by measuring susceptibility to the SIFI before and after the intervention and control conditions. Training resulted in improved measures of functional balance and postural control (e.g. displacement of centre of pressure) for the participants assigned to the Intervention group only. Improved functional balance was correlated with an increase in efficient multisensory processing in the fall-prone older adults only. Our findings suggest important links between balance control and multisensory interactions in the ageing brain and have implications for rehabilitation to reduce the risk of falls in older adults.