Sensory impairment is common in older age and may be associated with intra- and interpersonal struggles. Treatment and intervention efforts may be hampered by functional difficulties or unwillingness to receive face-to-face mental health services. The current study seeks to assess the efficacy of an online psychological intervention for older adults with sensory loss and their spouses in Denmark, using a two-arm, parallel-group, randomized controlled trial study design. Participants will be randomly assigned to the intervention group or waiting list control group. The intervention consists of four digital, sequential modules that contain psycho-education and Acceptance and Commitment Therapy inspired therapeutic activities. Individuals will be assessed at baseline, 6 weeks, and 10 weeks post-baseline, and for the intervention group only, at 18-weeks. The outcomes are well-being (primary), relationship satisfaction (secondary), and depressive symptoms (tertiary). The data will be analyzed using multilevel modeling to account for non-independence of data (nesting within participant and within couple). This is the first randomized controlled trial study of an online psychological intervention for older adults with sensory loss and their spouses and it will provide valuable knowledge regarding whether internet-delivered intervention is effective for this population group.