A meeting was held at Hampden today to consider two charges relating to the Tynecastle club's payment of bonuses.
A statement from the SPL read: "The sub-committee found the club guilty of breaching SPL Rules A6.21 and A6.22 in respect of a number of players.
"The club remains subject to the existing registration embargo, which will continue in effect until such time as the SPL board is satisfied that the remuneration default is no longer ongoing.
"However, the decision of the sub-committee today was that the club should be made subject to further restrictions on the registration of players."
The restrictions relate to how and when Hearts can sign players.
The restrictions on Hearts, who play Hibernian in the Edinburgh derby on Thursday, will be in place until the SPL board determines they should be lifted.
They are: - One out, one in (ie: the club will only be able to replace such number of players as have their registrations with the club terminated - whether by sale, mutual agreement or otherwise)
- Only under-21 players (as defined in the SPL rules) will be able to be registered.
- Any new under-21 player registered must have an annualised employment cost lower than that of the player leaving the club.
Despite winning the William Hill Scottish Cup in May with a 5-1 win over Edinburgh rivals Hibs, Hearts have endured a torrid 2012 off the field.
A £450,000 winding-up order was recently averted, while an agreement was reached over a separate issue to pay £1.5million over a three-year period.
Hearts raised £1million from a share issue designed to raise £1.79million and face a shortfall of £800,000 this season unless attendances are above expectations.
Manager John McGlynn was installed in the summer, tasked to introduce young players, and recognises the challenge Hearts face to reduce costs.
Their leading players could depart during the winter transfer window, which opens tomorrow, forcing McGlynn to select inexperienced players.
Speaking last week, McGlynn said: "We're going to have to go through a transitional period right now and another one in the summer. That's how it will be.
"If we have to put more younger players into the team then fair enough.
"That was my brief, to come here and try to bring through young players.
"This is probably the most difficult time for Heart of Midlothian Football Club. I don't think they've ever had a transfer embargo in the past or been so close to a winding-up order.
"It's a big challenge."