The Irish Kidney Association said it hoped new legislation would come into force to allow people who do not want to donate their organs to opt out.
This year, the Human Tissue Law came into force.
This includes provisions for an online opt-out registry that has not yet been launched.
This records details of people who choose not to be considered as potential donors.
Health Minister Stephen Donnelly said he aims to have the opt-out system up and running by the end of the year.
He added that a lot of work and regulation is needed for that to happen.
IKA chief executive Carol Moore said anyone who doesn't object is considered a potential organ donor, but organs will only be donated with the family's consent.
There are currently more than 600 people on the transplant waiting list.
A total of 282 organ transplants were performed last year, including 30 living donor kidney transplants.
This is the highest figure for the past six years, but the Irish Kidney Association says figures have effectively returned to pre-Covid levels.
The organization aims to complete more than 50 living donor kidney transplants.
The government has committed to introducing an annual nationwide audit of potential donors.
The IKA said this would provide guidance to hospitals and identify areas where raising awareness about organ donation could lead to an increase in organ donations.
The IKA said more infrastructure needed to be developed to ensure an increase in organ transplants.
National Organ Donation Awareness Week starts next Saturday.
